diff --git a/lib/js/src/thrift.js b/lib/js/src/thrift.js
index c846162..3ea57c8 100644
--- a/lib/js/src/thrift.js
+++ b/lib/js/src/thrift.js
@@ -310,6 +310,7 @@
     this.wpos = 0;
     this.rpos = 0;
     this.useCORS = (options && options.useCORS);
+    this.customHeaders = options ? (options.customHeaders ? options.customHeaders : {}): {};
     this.send_buf = '';
     this.recv_buf = '';
 };
@@ -376,6 +377,11 @@
 
         xreq.open('POST', this.url, !!async);
 
+        // add custom headers
+        Object.keys(self.customHeaders).forEach(function(prop) {
+            xreq.setRequestHeader(prop, self.customHeaders[prop]);
+        });
+
         if (xreq.setRequestHeader) {
             xreq.setRequestHeader('Accept', 'application/vnd.apache.thrift.json; charset=utf-8');
             xreq.setRequestHeader('Content-Type', 'application/vnd.apache.thrift.json; charset=utf-8');