csharp-mvc: change api/convert method to post

web/documentserver-example/csharp-mvc/Scripts/jscript.js

@@ -89,14 +89,14 @@ if (typeof jQuery != "undefined") {
         }
 
         timer = setTimeout(function () {
-            var requestAddress = UrlConverter
-                + "&filename=" + encodeURIComponent(jq("#hiddenFileName").val());
 
             jq.ajax({
                 async: true,
                 contentType: "text/xml",
-                type: "get",
-                url: requestAddress,
+                type: "post",
+                dataType: "json",
+                data: JSON.stringify({ filename: fileName }),
+                url: UrlConverter,
                 complete: function (data) {
                     var responseText = data.responseText;
                     var response = jq.parseJSON(responseText);