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<p>Langflow includes an endpoint that is compatible with the <a href="https://platform.openai.com/docs/api-reference/responses" target="_blank" rel="noopener noreferrer">OpenAI Responses API</a>.
|
||
It is available at <code>POST /api/v1/responses</code>.</p>
|
||
<p>This endpoint allows you to use existing OpenAI client libraries with minimal code changes.
|
||
You only need to replace the <code>model</code> name, such as <code>gpt-4</code>, with your <code>flow_id</code>.
|
||
You can find Flow IDs in the code snippets on the <a href="/concepts-publish#api-access"><strong>API access</strong> pane</a> or in a flow's URL.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites"></a></h2>
|
||
<p>To be compatible with Langflow's OpenAI Responses API endpoint, your flow and request must adhere to the following requirements:</p>
|
||
<ul>
|
||
<li><strong>Chat Input</strong>: Your flow must contain a <strong>Chat Input</strong> component.
|
||
Flows without this component return an error when passed to this endpoint.
|
||
The component types <code>ChatInput</code> and <code>Chat Input</code> are recognized as chat inputs.</li>
|
||
<li><strong>Tools</strong>: The <code>tools</code> parameter isn't supported, and returns an error if provided.</li>
|
||
<li><strong>Model Names</strong>: In your request, the <code>model</code> field must contain a valid flow ID or endpoint name.</li>
|
||
<li><strong>Authentication</strong>: All requests require an API key passed in the <code>x-api-key</code> header.
|
||
For more information, see <a href="/api-keys-and-authentication">API keys and authentication</a>.</li>
|
||
</ul>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="additional-configuration-for-openai-client-libraries">Additional configuration for OpenAI client libraries<a href="#additional-configuration-for-openai-client-libraries" class="hash-link" aria-label="Direct link to Additional configuration for OpenAI client libraries" title="Direct link to Additional configuration for OpenAI client libraries"></a></h3>
|
||
<p>This endpoint is compatible with OpenAI's API, but requires special configuration when using OpenAI client libraries.
|
||
Langflow uses <code>x-api-key</code> headers for authentication, while OpenAI uses <code>Authorization: Bearer</code> headers.
|
||
When sending requests to Langflow with OpenAI client libraries, you must configure custom headers and include an <code>api_key</code> configuration.
|
||
The <code>api_key</code> parameter can have any value, such as <code>"dummy-api-key"</code> in the client examples, as the actual authentication is handled through the <code>default_headers</code> configuration.</p>
|
||
<p>In the following examples, replace the values for <code>LANGFLOW_SERVER_URL</code>, <code>LANGFLOW_API_KEY</code>, and <code>FLOW_ID</code> with values from your deployment.</p>
|
||
<div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">OpenAI Python Client</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">OpenAI TypeScript Client</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>from openai import OpenAI</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>client = OpenAI(</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> base_url="LANGFLOW_SERVER_URL/api/v1/",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> default_headers={"x-api-key": "LANGFLOW_API_KEY"},</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> api_key="dummy-api-key" # Required by OpenAI SDK but not used by Langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>)</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>response = client.responses.create(</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> model="FLOW_ID",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> input="There is an event that happens on the second wednesday of every month. What are the event dates in 2026?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>)</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>print(response.output_text)</span></div></div><br></code></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span>import OpenAI from "openai";</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span>const client = new OpenAI({</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span> baseURL: "LANGFLOW_SERVER_URL/api/v1/",</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span> defaultHeaders: {</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span> "x-api-key": "LANGFLOW_API_KEY"</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span> },</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span> apiKey: "dummy-api-key" // Required by OpenAI SDK but not used by Langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span>});</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span>const response = await client.responses.create({</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span> model: "FLOW_ID",</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span> input: "There is an event that happens on the second wednesday of every month. What are the event dates in 2026?"</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span>});</span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->16</span><div style="display:inline-block;margin-left:16px"><span>console.log(response.output_text);</span></div></div><br></code></div></div></div></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Response</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>Here are the event dates for the second Wednesday of each month in 2026:</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- January 14, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- February 11, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- March 11, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- April 8, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- May 13, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- June 10, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- July 8, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- August 12, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- September 9, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- October 14, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- November 11, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>- December 9, 2026</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>If you need these in a different format or want a downloadable calendar, let me know!</span></div></div><br></code></div></div></div></div></details>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="example-request">Example request<a href="#example-request" class="hash-link" aria-label="Direct link to Example request" title="Direct link to Example request"></a></h2>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_SERVER_URL/api/v1/responses" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "$YOUR_FLOW_ID",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input": "Hello, how are you?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "stream": false</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="headers">Headers<a href="#headers" class="hash-link" aria-label="Direct link to Headers" title="Direct link to Headers"></a></h3>
|
||
<table><thead><tr><th>Header</th><th>Required</th><th>Description</th><th>Example</th></tr></thead><tbody><tr><td><code>x-api-key</code></td><td>Yes</td><td>Your Langflow API key for authentication</td><td><code>"sk-..."</code></td></tr><tr><td><code>Content-Type</code></td><td>Yes</td><td>Specifies the JSON format</td><td><code>"application/json"</code></td></tr><tr><td><code>X-LANGFLOW-GLOBAL-VAR-*</code></td><td>No</td><td>Global variables for the flow</td><td><code>"X-LANGFLOW-GLOBAL-VAR-API_KEY: sk-..."</code> For more, see <a href="#global-var">Pass global variables to your flows in headers</a>.</td></tr></tbody></table>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="request-body">Request body<a href="#request-body" class="hash-link" aria-label="Direct link to Request body" title="Direct link to Request body"></a></h3>
|
||
<table><thead><tr><th>Field</th><th>Type</th><th>Required</th><th>Default</th><th>Description</th></tr></thead><tbody><tr><td><code>model</code></td><td><code>string</code></td><td>Yes</td><td>-</td><td>The flow ID or endpoint name to execute.</td></tr><tr><td><code>input</code></td><td><code>string</code></td><td>Yes</td><td>-</td><td>The input text to process.</td></tr><tr><td><code>stream</code></td><td><code>boolean</code></td><td>No</td><td><code>false</code></td><td>Whether to stream the response.</td></tr><tr><td><code>background</code></td><td><code>boolean</code></td><td>No</td><td><code>false</code></td><td>Whether to process in background.</td></tr><tr><td><code>tools</code></td><td><code>list[Any]</code></td><td>No</td><td><code>null</code></td><td>Tools are not supported yet.</td></tr><tr><td><code>previous_response_id</code></td><td><code>string</code></td><td>No</td><td><code>null</code></td><td>ID of previous response to continue conversation. For more, see <a href="#response-id">Continue conversations with response and session IDs</a>.</td></tr><tr><td><code>include</code></td><td><code>list[string]</code></td><td>No</td><td><code>null</code></td><td>Additional response data to include, such as <code>['tool_call.results']</code>. For more, see <a href="#tool-call-results">Retrieve tool call results</a>.</td></tr></tbody></table>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="example-response">Example response<a href="#example-response" class="hash-link" aria-label="Direct link to Example response" title="Direct link to Example response"></a></h2>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "id": "e5e8ef8a-7efd-4090-a110-6aca082bceb7",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "object": "response",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "created_at": 1756837941,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "output": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "type": "message",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "id": "msg_e5e8ef8a-7efd-4090-a110-6aca082bceb7",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "role": "assistant",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "content": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "type": "output_text",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "text": "Hello! I'm here and ready to help. How can I assist you today?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "annotations": []</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "parallel_tool_calls": true,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "reasoning": {"effort": null, "summary": null},</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "store": true,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "temperature": 1.0,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "text": {"format": {"type": "text"}},</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "tool_choice": "auto",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "tools": [],</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "top_p": 1.0,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "truncation": "disabled",</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "usage": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "user": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span> "metadata": {}</span></div></div><div><span class="ch-code-line-number">_<!-- -->35</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="response-body">Response body<a href="#response-body" class="hash-link" aria-label="Direct link to Response body" title="Direct link to Response body"></a></h3>
|
||
<p>The response contains fields that Langflow sets dynamically and fields that use OpenAI-compatible defaults.</p>
|
||
<p>The OpenAI-compatible default values shown above are currently fixed and cannot be modified via the request.
|
||
They are included to maintain API compatibility and provide a consistent response format.</p>
|
||
<p>For your requests, you will only be setting the dynamic fields.
|
||
The default values are documented here for completeness and to show the full response structure.</p>
|
||
<p>Fields set dynamically by Langflow:</p>
|
||
<table><thead><tr><th>Field</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td><code>id</code></td><td><code>string</code></td><td>Unique response identifier.</td></tr><tr><td><code>created_at</code></td><td><code>int</code></td><td>Unix timestamp of response creation.</td></tr><tr><td><code>model</code></td><td><code>string</code></td><td>The flow ID that was executed.</td></tr><tr><td><code>output</code></td><td><code>list[dict]</code></td><td>Array of output items (messages, tool calls, etc.).</td></tr><tr><td><code>previous_response_id</code></td><td><code>string</code></td><td>ID of previous response if continuing conversation.</td></tr></tbody></table>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Fields with OpenAI-compatible default values</summary><div><div class="collapsibleContent_i85q"><table><thead><tr><th>Field</th><th>Type</th><th>Default Value</th><th>Description</th></tr></thead><tbody><tr><td><code>object</code></td><td><code>string</code></td><td><code>"response"</code></td><td>Always <code>"response"</code>.</td></tr><tr><td><code>status</code></td><td><code>string</code></td><td><code>"completed"</code></td><td>Response status: <code>"completed"</code>, <code>"in_progress"</code>, or <code>"failed"</code>.</td></tr><tr><td><code>error</code></td><td><code>dict</code></td><td><code>null</code></td><td>Error details (if any).</td></tr><tr><td><code>incomplete_details</code></td><td><code>dict</code></td><td><code>null</code></td><td>Incomplete response details (if any).</td></tr><tr><td><code>instructions</code></td><td><code>string</code></td><td><code>null</code></td><td>Response instructions (if any).</td></tr><tr><td><code>max_output_tokens</code></td><td><code>int</code></td><td><code>null</code></td><td>Maximum output tokens (if any).</td></tr><tr><td><code>parallel_tool_calls</code></td><td><code>boolean</code></td><td><code>true</code></td><td>Whether parallel tool calls are enabled.</td></tr><tr><td><code>reasoning</code></td><td><code>dict</code></td><td><code>{"effort": null, "summary": null}</code></td><td>Reasoning information with effort and summary.</td></tr><tr><td><code>store</code></td><td><code>boolean</code></td><td><code>true</code></td><td>Whether response is stored.</td></tr><tr><td><code>temperature</code></td><td><code>float</code></td><td><code>1.0</code></td><td>Temperature setting.</td></tr><tr><td><code>text</code></td><td><code>dict</code></td><td><code>{"format": {"type": "text"}}</code></td><td>Text format configuration.</td></tr><tr><td><code>tool_choice</code></td><td><code>string</code></td><td><code>"auto"</code></td><td>Tool choice setting.</td></tr><tr><td><code>tools</code></td><td><code>list[dict]</code></td><td><code>[]</code></td><td>Available tools.</td></tr><tr><td><code>top_p</code></td><td><code>float</code></td><td><code>1.0</code></td><td>Top-p setting.</td></tr><tr><td><code>truncation</code></td><td><code>string</code></td><td><code>"disabled"</code></td><td>Truncation setting.</td></tr><tr><td><code>usage</code></td><td><code>dict</code></td><td><code>null</code></td><td>Usage statistics (if any).</td></tr><tr><td><code>user</code></td><td><code>string</code></td><td><code>null</code></td><td>User identifier (if any).</td></tr><tr><td><code>metadata</code></td><td><code>dict</code></td><td><code>{}</code></td><td>Additional metadata.</td></tr></tbody></table></div></div></details>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="example-streaming-request">Example streaming request<a href="#example-streaming-request" class="hash-link" aria-label="Direct link to Example streaming request" title="Direct link to Example streaming request"></a></h2>
|
||
<p>When you set <code>"stream": true</code> with your request, the API returns a stream where each chunk contains a small piece of the response as it's generated. This provides a real-time experience where users can see the AI's output appear word by word, similar to ChatGPT's typing effect.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_SERVER_URL/api/v1/responses" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "$FLOW_ID",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input": "Tell me a story about a robot",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "stream": true</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "id": "f7fcea36-f128-41c4-9ac1-e683137375d5",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "object": "response.chunk",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "created": 1756838094,</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "delta": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "content": "Once"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> },</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "status": null</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="streaming-response-body">Streaming response body<a href="#streaming-response-body" class="hash-link" aria-label="Direct link to Streaming response body" title="Direct link to Streaming response body"></a></h3>
|
||
<table><thead><tr><th>Field</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td><code>id</code></td><td><code>string</code></td><td>Unique response identifier.</td></tr><tr><td><code>object</code></td><td><code>string</code></td><td>Always <code>"response.chunk"</code>.</td></tr><tr><td><code>created</code></td><td><code>int</code></td><td>Unix timestamp of chunk creation.</td></tr><tr><td><code>model</code></td><td><code>string</code></td><td>The flow ID that was executed.</td></tr><tr><td><code>delta</code></td><td><code>dict</code></td><td>The new content chunk.</td></tr><tr><td><code>status</code></td><td><code>string</code></td><td>Response status: <code>"completed"</code>, <code>"in_progress"</code>, or <code>"failed"</code> (optional).</td></tr></tbody></table>
|
||
<p>The stream continues until a final chunk with <code>"status": "completed"</code> indicates the response is finished.</p>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Final completion chunk</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "id": "f7fcea36-f128-41c4-9ac1-e683137375d5",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "object": "response.chunk",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "created": 1756838094,</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "delta": {},</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="response-id">Continue conversations with response and session IDs<a href="#response-id" class="hash-link" aria-label="Direct link to Continue conversations with response and session IDs" title="Direct link to Continue conversations with response and session IDs"></a></h2>
|
||
<p>Conversation continuity allows you to maintain context across multiple API calls, enabling multi-turn conversations with your flows. This is essential for building chat applications where users can have ongoing conversations.</p>
|
||
<p>When you make a request, the API returns a response with an <code>id</code> field. You can use this <code>id</code> as the <code>previous_response_id</code> in your next request to continue the conversation from where it left off.</p>
|
||
<p>First Message:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "http://$LANGFLOW_SERVER_URL/api/v1/responses" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "$FLOW_ID",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input": "Hello, my name is Alice"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "c45f4ac8-772b-4675-8551-c560b1afd590",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "object": "response",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "created_at": 1756839042,</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "output": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "message",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "msg_c45f4ac8-772b-4675-8551-c560b1afd590",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "role": "assistant",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "content": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "output_text",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "text": "Hello, Alice! How can I assist you today?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "annotations": []</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": null</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
<p>Follow-up message:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "http://$LANGFLOW_SERVER_URL/api/v1/responses" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input": "What's my name?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": "c45f4ac8-772b-4675-8551-c560b1afd590"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "c45f4ac8-772b-4675-8551-c560b1afd590",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "object": "response",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "created_at": 1756839043,</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "output": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "message",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "msg_c45f4ac8-772b-4675-8551-c560b1afd590",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "role": "assistant",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "content": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "output_text",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "text": "Your name is Alice. How can I help you today?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "annotations": []</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": "c45f4ac8-772b-4675-8551-c560b1afd590"</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
<p>Optionally, you can use your own session ID values for the <code>previous_response_id</code>:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "http://$LANGFLOW_SERVER_URL/api/v1/responses" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input": "What's my name?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": "session-alice-1756839048"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><p>This example uses the same flow as the other <code>previous_response_id</code> examples, but the LLM had not yet been introduced to Alice in the specified session:</p><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "session-alice-1756839048",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "object": "response",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "created_at": 1756839048,</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "output": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "message",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "msg_session-alice-1756839048",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "role": "assistant",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "content": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "output_text",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "text": "I don't have access to your name unless you tell me. If you'd like, you can share your name, and I'll remember it for this conversation!",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "annotations": []</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": "session-alice-1756839048"</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="tool-call-results">Retrieve tool call results<a href="#tool-call-results" class="hash-link" aria-label="Direct link to Retrieve tool call results" title="Direct link to Retrieve tool call results"></a></h2>
|
||
<p>When you send a request to the <code>/api/v1/responses</code> endpoint to run a flow that includes tools or function calls, you can retrieve the raw tool execution details by adding <code>"include": ["tool_call.results"]</code> to the request payload.</p>
|
||
<p>Without the <code>include</code> parameter, tool calls return basic function call information, but not the raw tool results.
|
||
For example:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "id": "fc_1",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "type": "function_call",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "name": "evaluate_expression",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "arguments": "{\"expression\": \"15*23\"}"</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>},</span></div></div><br></code></div></div>
|
||
<p>To get the raw <code>results</code> of each tool execution, add <code>include: ["tool_call.results"]</code> to the request payload:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "http://$LANGFLOW_SERVER_URL/api/v1/responses" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "model": "FLOW_ID",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "input": "Calculate 23 * 15 and show me the result",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "stream": false,</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "include": ["tool_call.results"]</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<p>The response now includes the tool call's results.
|
||
For example:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "id": "evaluate_expression_1",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "type": "tool_call",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "tool_name": "evaluate_expression",</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "queries": ["15*23"],</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span> "results": {"result": "345"}</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "id": "a6e5511e-71f8-457a-88d2-7d8c6ea34e36",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "object": "response",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "created_at": 1756835379,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "error": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "incomplete_details": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "instructions": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "max_output_tokens": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "output": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "id": "evaluate_expression_1",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "queries": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "15*23"</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "tool_name": "evaluate_expression",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "type": "tool_call",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "results": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "result": "345"</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> },</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "type": "message",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "id": "msg_a6e5511e-71f8-457a-88d2-7d8c6ea34e36",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "role": "assistant",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "content": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "type": "output_text",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "text": "The result of 23 * 15 is 345.",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "annotations": []</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "parallel_tool_calls": true,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "reasoning": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "effort": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "summary": null</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> },</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "store": true,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "temperature": 1.0,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "text": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "format": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "type": "text"</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> },</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "tool_choice": "auto",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "tools": [],</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "top_p": 1.0,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "truncation": "disabled",</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "usage": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "user": null,</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span> "metadata": {}</span></div></div><div><span class="ch-code-line-number">_<!-- -->58</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="global-var">Pass global variables to your flows in headers<a href="#global-var" class="hash-link" aria-label="Direct link to Pass global variables to your flows in headers" title="Direct link to Pass global variables to your flows in headers"></a></h2>
|
||
<p>Global variables allow you to pass dynamic values to your flows that can be used by components within that flow run.
|
||
This is useful for passing API keys, user IDs, or any other configuration that might change between requests.</p>
|
||
<p>The <code>/responses</code> endpoint accepts global variables as custom HTTP headers with the format <code>X-LANGFLOW-GLOBAL-VAR-{VARIABLE_NAME}</code>.
|
||
Variables are only available during this specific request execution and aren't persisted.
|
||
Variable names are automatically converted to uppercase.</p>
|
||
<p>This example demonstrates passing an <code>OPENAI_API_KEY</code> variable, which is a variable Langflow automatically detects from environment variables, with two custom variables for <code>USER_ID</code> and <code>ENVIRONMENT</code>. The variables don't have to be created in Langflow's Global Variables section - you can pass any variable name in the <code>X-LANGFLOW-GLOBAL-VAR-{VARIABLE_NAME}</code> header format.</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>curl -X POST \</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "$LANGFLOW_SERVER_URL/api/v1/responses" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> -H "x-api-key: $LANGFLOW_API_KEY" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> -H "Content-Type: application/json" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> -H "X-LANGFLOW-GLOBAL-VAR-OPENAI_API_KEY: sk-..." \</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> -H "X-LANGFLOW-GLOBAL-VAR-USER_ID: user123" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> -H "X-LANGFLOW-GLOBAL-VAR-ENVIRONMENT: production" \</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> -d '{</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "model": "your-flow-id",</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "input": "Hello"</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> }'</span></div></div><br></code></div></div>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Result</summary><div><div class="collapsibleContent_i85q"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "4a4d2f24-bb45-4a55-a499-0191305264be",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "object": "response",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "created_at": 1756839935,</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "model": "ced2ec91-f325-4bf0-8754-f3198c2b1563",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "output": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "message",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "id": "msg_4a4d2f24-bb45-4a55-a499-0191305264be",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "status": "completed",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "role": "assistant",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "content": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> {</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "type": "output_text",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "text": "Hello! How can I assist you today?",</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "annotations": []</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span> "previous_response_id": null</span></div></div><div><span class="ch-code-line-number">_<!-- -->23</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></details>
|
||
<p>Variables passed with <code>X-LANGFLOW-GLOBAL-VAR-{VARIABLE_NAME}</code> are always available to your flow, regardless of whether they exist in the database.</p>
|
||
<p>If your flow components reference variables that aren't provided in headers or your Langflow database, the flow fails by default.
|
||
To avoid this, you can set the <code>FALLBACK_TO_ENV_VARS</code> environment variable is <code>true</code>, which allows the flow to use values from the <code>.env</code> file if they aren't otherwise specified.</p>
|
||
<p>In the above example, <code>OPENAI_API_KEY</code> will fall back to the database variable if not provided in the header.
|
||
<code>USER_ID</code> and <code>ENVIRONMENT</code> will fall back to environment variables if <code>FALLBACK_TO_ENV_VARS</code> is enabled.
|
||
Otherwise, the flow fails.</p></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/api-flows-run"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Flow trigger endpoints</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/api-flows"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Flow management endpoints</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#prerequisites" class="table-of-contents__link toc-highlight">Prerequisites</a><ul><li><a href="#additional-configuration-for-openai-client-libraries" class="table-of-contents__link toc-highlight">Additional configuration for OpenAI client libraries</a></li></ul></li><li><a href="#example-request" class="table-of-contents__link toc-highlight">Example request</a><ul><li><a href="#headers" class="table-of-contents__link toc-highlight">Headers</a></li><li><a href="#request-body" class="table-of-contents__link toc-highlight">Request body</a></li></ul></li><li><a href="#example-response" class="table-of-contents__link toc-highlight">Example response</a><ul><li><a href="#response-body" class="table-of-contents__link toc-highlight">Response body</a></li></ul></li><li><a href="#example-streaming-request" class="table-of-contents__link toc-highlight">Example streaming request</a><ul><li><a href="#streaming-response-body" class="table-of-contents__link toc-highlight">Streaming response body</a></li></ul></li><li><a href="#response-id" class="table-of-contents__link toc-highlight">Continue conversations with response and session IDs</a></li><li><a href="#tool-call-results" class="table-of-contents__link toc-highlight">Retrieve tool call results</a></li><li><a href="#global-var" class="table-of-contents__link toc-highlight">Pass global variables to your flows in headers</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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