diff --git a/lib/js/src/thrift.js b/lib/js/src/thrift.js
index 9bf8127..fad24d6 100644
--- a/lib/js/src/thrift.js
+++ b/lib/js/src/thrift.js
@@ -438,7 +438,12 @@
                 }
             },
             context: client,
-            success: jQuery.makeArray(args).pop()
+            success: jQuery.makeArray(args).pop(),
+            beforeSend: function (xreq) {
+                Object.keys(thriftTransport.customHeaders).forEach(function (prop) {
+                    xreq.setRequestHeader(prop, thriftTransport.customHeaders[prop]);
+                });
+            }
         });
 
         return jqXHR;