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</li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_z5aJ"><div class="docItemContainer_c0TR"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" aria-hidden="true" focusable="false" role="presentation" class="breadcrumbHomeIcon_xK9p"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Develop</span></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Observability</span></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Monitoring</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Langfuse</span></li></ul></nav><div class="docMetaRow_c2hx"><div class="root_Eutc"><button type="button" class="button_gpNY"><span aria-hidden="true" class="icon_Bm9L"><svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-copy"><rect width="14" height="14" x="8" y="8" rx="2" ry="2"></rect><path d="M4 16c-1.1 0-2-.9-2-2V4c0-1.1.9-2 2-2h10c1.1 0 2 .9 2 2"></path></svg></span><span class="label_LzDG">Copy page</span></button></div><span class="theme-doc-version-badge badge badge--secondary">Version: 1.9.x</span></div><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Langfuse</h1></header><style>[data-ch-theme="github-dark"] { --ch-t-colorScheme: dark;--ch-t-foreground: #c9d1d9;--ch-t-background: #0d1117;--ch-t-lighter-inlineBackground: #0d1117e6;--ch-t-editor-background: #0d1117;--ch-t-editor-foreground: #c9d1d9;--ch-t-editor-lineHighlightBackground: #6e76811a;--ch-t-editor-rangeHighlightBackground: #ffffff0b;--ch-t-editor-infoForeground: #3794FF;--ch-t-editor-selectionBackground: #264F78;--ch-t-focusBorder: #1f6feb;--ch-t-tab-activeBackground: #0d1117;--ch-t-tab-activeForeground: #c9d1d9;--ch-t-tab-inactiveBackground: #010409;--ch-t-tab-inactiveForeground: #8b949e;--ch-t-tab-border: #30363d;--ch-t-tab-activeBorder: #0d1117;--ch-t-editorGroup-border: #30363d;--ch-t-editorGroupHeader-tabsBackground: #010409;--ch-t-editorLineNumber-foreground: #6e7681;--ch-t-input-background: #0d1117;--ch-t-input-foreground: #c9d1d9;--ch-t-input-border: #30363d;--ch-t-icon-foreground: #8b949e;--ch-t-sideBar-background: #010409;--ch-t-sideBar-foreground: #c9d1d9;--ch-t-sideBar-border: #30363d;--ch-t-list-activeSelectionBackground: #6e768166;--ch-t-list-activeSelectionForeground: #c9d1d9;--ch-t-list-hoverBackground: #6e76811a;--ch-t-list-hoverForeground: #c9d1d9; }</style>
|
||
<!-- -->
|
||
<p><a href="https://langfuse.com" target="_blank" rel="noopener noreferrer" class="">Langfuse</a> is an open-source platform for LLM observability. It provides tracing and monitoring capabilities for AI applications, helping developers debug, analyze, and optimize their AI systems. Langfuse integrates with various tools and frameworks, including workflow builders and runtimes like Langflow.</p>
|
||
<p>This guide explains how to configure Langflow to collect <a href="https://langfuse.com/docs/tracing" target="_blank" rel="noopener noreferrer" class="">tracing</a> data about your flow executions and automatically send the data to Langfuse.</p>
|
||
<iframe width="760" height="415" src="https://www.youtube.com/embed/SA9gGbzwNGU?si=eDKvdtvhb3fJCSbl" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin"></iframe>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites" translate="no"></a></h2>
|
||
<ul>
|
||
<li class="">An account in a <a href="https://cloud.langfuse.com" target="_blank" rel="noopener noreferrer" class="">Langfuse Cloud</a> or <a href="https://langfuse.com/self-hosting" target="_blank" rel="noopener noreferrer" class="">Langfuse self-hosted</a> instance</li>
|
||
<li class="">A <a class="" href="/get-started-installation">running Langflow server</a> with a <a class="" href="/concepts-flows">flow</a> that you want to trace</li>
|
||
</ul>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16" role="img" aria-label="Tip icon" focusable="false"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>If you need a flow to test the Langfuse integration, see the <a class="" href="/get-started-quickstart">Langflow quickstart</a>.</p></div></div>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="langfuse-credentials">Set Langfuse credentials as environment variables<a href="#langfuse-credentials" class="hash-link" aria-label="Direct link to Set Langfuse credentials as environment variables" title="Direct link to Set Langfuse credentials as environment variables" translate="no"></a></h2>
|
||
<ol>
|
||
<li class="">
|
||
<p>Create a set of <a href="https://langfuse.com/faq/all/where-are-langfuse-api-keys" target="_blank" rel="noopener noreferrer" class="">Langfuse API keys</a>.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>Copy the following API key information:</p>
|
||
<ul>
|
||
<li class="">Secret key</li>
|
||
<li class="">Public key</li>
|
||
<li class="">Base URL</li>
|
||
</ul>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16" role="img" aria-label="Tip icon" focusable="false"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>Langflow previously used <code>LANGFUSE_HOST</code> as the variable for the Langfuse base URL.
|
||
This is still supported for backward compatibility, but <code>LANGFUSE_BASE_URL</code> is now the preferred environment variable and will be used if both values are set.</p></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Set your Langfuse project credentials as environment variables.</p>
|
||
<p>In the following examples, replace <code>SECRET_KEY</code>, <code>PUBLIC_KEY</code>, and <code>LANGFUSE_BASE_URL</code> with your API key details from Langfuse.
|
||
Add the following entries to your <code>.env</code> file:</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>LANGFUSE_SECRET_KEY=sk-...</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFUSE_PUBLIC_KEY=pk-...</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFUSE_BASE_URL=https://us.cloud.langfuse.com</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Start Langflow with the configuration in the <code>.env</code> file:</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>uv run langflow run --env-file .env</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Run a flow.</p>
|
||
<p>Langflow automatically collects and sends tracing data about the flow execution to Langfuse.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>View the collected data in your <a href="https://langfuse.com/docs/analytics/overview" target="_blank" rel="noopener noreferrer" class="">Langfuse dashboard</a>.</p>
|
||
<p>Langfuse also provides a <a href="https://cloud.langfuse.com/project/cm0nywmaa005c3ol2msoisiho/traces/f016ae6d-4527-43f5-93ba-9d78388cd3d9" target="_blank" rel="noopener noreferrer" class="">public live trace example dashboard</a>.</p>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="disable-langfuse-tracing">Disable Langfuse tracing<a href="#disable-langfuse-tracing" class="hash-link" aria-label="Direct link to Disable Langfuse tracing" title="Direct link to Disable Langfuse tracing" translate="no"></a></h2>
|
||
<p>To disable the Langfuse integration, remove the <a href="#langfuse-credentials" class="">Langfuse environment variables</a>, and then restart Langflow.</p>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="run-langfuse-and-langflow-with-docker-compose">Run Langfuse and Langflow with Docker Compose<a href="#run-langfuse-and-langflow-with-docker-compose" class="hash-link" aria-label="Direct link to Run Langfuse and Langflow with Docker Compose" title="Direct link to Run Langfuse and Langflow with Docker Compose" translate="no"></a></h2>
|
||
<p>As an alternative to the previous setup, particularly for self-hosted Langfuse, you can run both services with Docker Compose.</p>
|
||
<ol>
|
||
<li class="">
|
||
<p>Create a set of <a href="https://langfuse.com/faq/all/where-are-langfuse-api-keys" target="_blank" rel="noopener noreferrer" class="">Langfuse API keys</a>.</p>
|
||
</li>
|
||
<li class="">
|
||
<p>Copy the following API key information:</p>
|
||
<ul>
|
||
<li class="">Secret key</li>
|
||
<li class="">Public key</li>
|
||
<li class="">Base URL</li>
|
||
</ul>
|
||
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16" role="img" aria-label="Tip icon" focusable="false"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>Langflow previously used <code>LANGFUSE_HOST</code> as the variable for the Langfuse base URL.
|
||
<code>LANGFUSE_HOST</code> is still supported for backward compatibility, but <code>LANGFUSE_BASE_URL</code> is the preferred environment variable.
|
||
If both values are set, then <code>LANGFLOW_BASE_URL</code> is used.</p></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Add your Langflow credentials to your Langflow <code>docker-compose.yml</code> file in the <code>environment</code> section.</p>
|
||
<p>The following example is based on the <a href="https://github.com/langflow-ai/langflow/blob/main/docker_example/docker-compose.yml" target="_blank" rel="noopener noreferrer" class="">example <code>docker-compose.yml</code></a>.</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">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span>services:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> langflow:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> image: langflowai/langflow:latest # or another version tag on https://hub.docker.com/r/langflowai/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> pull_policy: always # set to 'always' when using 'latest' image</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - "7860:7860"</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> depends_on:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFLOW_DATABASE_URL=postgresql://langflow:langflow@postgres:5432/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> # This variable defines where the logs, file storage, monitor data and secret keys are stored.</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFLOW_CONFIG_DIR=app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFUSE_SECRET_KEY=sk-...</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFUSE_PUBLIC_KEY=pk-...</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - LANGFUSE_BASE_URL=https://us.cloud.langfuse.com</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - langflow-data:/app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> postgres:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> image: postgres:16</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> POSTGRES_USER: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> POSTGRES_PASSWORD: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> POSTGRES_DB: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - "5432:5432"</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> - langflow-postgres:/var/lib/postgresql/data</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span>volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> langflow-postgres:</span></div></div><div><span class="ch-code-line-number">_<!-- -->32</span><div style="display:inline-block;margin-left:16px"><span> langflow-data:</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>Start the Docker container:</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>docker-compose up</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li class="">
|
||
<p>To confirm Langfuse is connected to your Langflow container, run the following command:</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>docker compose exec langflow python -c "import requests, os; addr = os.environ.get('LANGFUSE_BASE_URL'); print(addr); res = requests.get(addr, timeout=5); print(res.status_code)"</span></div></div><br></code></div></div>
|
||
<p>If there is an error, make sure you have set the <code>LANGFUSE_BASE_URL</code> environment variable in your <code>docker-compose.yml</code> file.</p>
|
||
<p>Output similar to the following indicates success:</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>https://us.cloud.langfuse.com</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>200</span></div></div><br></code></div></div>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="see-also">See also<a href="#see-also" class="hash-link" aria-label="Direct link to See also" title="Direct link to See also" translate="no"></a></h2>
|
||
<ul>
|
||
<li class=""><a href="https://github.com/langfuse/langfuse" target="_blank" rel="noopener noreferrer" class="">Langfuse GitHub repository</a></li>
|
||
</ul></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/integrations-arize"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Arize</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/integrations-langsmith"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">LangSmith</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></li><li><a href="#langfuse-credentials" class="table-of-contents__link toc-highlight">Set Langfuse credentials as environment variables</a></li><li><a href="#disable-langfuse-tracing" class="table-of-contents__link toc-highlight">Disable Langfuse tracing</a></li><li><a href="#run-langfuse-and-langflow-with-docker-compose" class="table-of-contents__link toc-highlight">Run Langfuse and Langflow with Docker Compose</a></li><li><a href="#see-also" class="table-of-contents__link toc-highlight">See also</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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