@@ -34,14 +34,14 @@ var bundle_size = 0;

 var jsSHA = require("./sha.js");

 function sendPayload(payload) {

-   var data = new FormData();

-   data.append(cfg_data_field, payload);

-

+    var data = encodeURIComponent(cfg_data_field) + '=' + encodeURIComponent(payload);

+    

    if (cfg_sign_field) {

       var sha = new jsSHA(cfg_sign_algo, "TEXT");

       sha.setHMACKey(cfg_sign_key, cfg_sign_key_format);

       sha.update(payload);

-      data.append(cfg_sign_field, sha.getHMAC(cfg_sign_field_format));

+      data += '&' + encodeURIComponent(cfg_sign_field) +'=' 

+                  + encodeURIComponent(sha.getHMAC(cfg_sign_field_format));

    }

    if (cfg_extra_fields.length > 0) {

@@ -49,12 +49,13 @@ function sendPayload(payload) {

          var decoded = decodeURIComponent(cfg_extra_fields[i]).split("=");

          var name = decoded.shift();

          var value = decoded.join("=");

-         data.append(name, value);

+         data += '&' + encodeURIComponent(name) + '=' + encodeURIComponent(value);

       }

    }

    i_sender = 1 - i_sender;

    senders[i_sender].open("POST", cfg_endpoint, true);

+   senders[i_sender].setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

    senders[i_sender].send(data);

 }