diff --git a/angular-file-upload-html5-shim.js b/angular-file-upload-html5-shim.js
index 12382ed..26e3c8f 100644
--- a/angular-file-upload-html5-shim.js
+++ b/angular-file-upload-html5-shim.js
@@ -1,7 +1,7 @@
 /**!
  * AngularJS file upload shim for angular XHR HTML5 browsers
  * @author  Danial  <danial.farid@gmail.com>
- * @version 1.2.2
+ * @version 1.2.3
  */
 if (window.XMLHttpRequest) {
 	if (window.FormData) {
diff --git a/angular-file-upload-html5-shim.min.js b/angular-file-upload-html5-shim.min.js
index 5ecb39e..6c7be17 100644
--- a/angular-file-upload-html5-shim.min.js
+++ b/angular-file-upload-html5-shim.min.js
@@ -1,2 +1,2 @@
-/*! 1.2.2 */
+/*! 1.2.3 */
 window.XMLHttpRequest&&window.FormData&&(XMLHttpRequest=function(a){return function(){var b=new a;return b.setRequestHeader=function(a){return function(c,d){if("__setXHR_"===c){var e=d(b);e instanceof Function&&e(b)}else a.apply(b,arguments)}}(b.setRequestHeader),b}}(XMLHttpRequest),window.XMLHttpRequest.__isShim=!0);
\ No newline at end of file
diff --git a/angular-file-upload-shim.js b/angular-file-upload-shim.js
index 83b600b..f3db09c 100755
--- a/angular-file-upload-shim.js
+++ b/angular-file-upload-shim.js
@@ -1,7 +1,7 @@
 /**!
  * AngularJS file upload shim for HTML5 FormData
  * @author  Danial  <danial.farid@gmail.com>
- * @version 1.2.2
+ * @version 1.2.3
  */
 (function() {
 
diff --git a/angular-file-upload-shim.min.js b/angular-file-upload-shim.min.js
index 7293a9e..c6b197d 100755
--- a/angular-file-upload-shim.min.js
+++ b/angular-file-upload-shim.min.js
@@ -1,2 +1,2 @@
-/*! 1.2.2 */
+/*! 1.2.3 */
 !function(){if(window.XMLHttpRequest&&(window.XMLHttpRequest=window.FormData?function(a){return function(){var b=new a;return b.setRequestHeader=function(a){return function(c,d){if("__setXHR_"===c){var e=d(b);e instanceof Function&&e(b)}else a.apply(b,arguments)}}(b.setRequestHeader),b}}(window.XMLHttpRequest):function(a){return function(){var b=new a,c=b.send;return b.__requestHeaders=[],b.open=function(a){return b.upload={addEventListener:function(a,c){"progress"===a&&(b.__progress=c),"load"===a&&(b.__load=c)}},function(c,d,e){a.apply(b,[c,d,e]),b.__url=d}}(b.open),b.getResponseHeader=function(a){return function(c){return b.__fileApiXHR?b.__fileApiXHR.getResponseHeader(c):a.apply(b,[c])}}(b.getResponseHeader),b.getAllResponseHeaders=function(a){return function(){return b.__fileApiXHR?b.__fileApiXHR.getAllResponseHeaders():a.apply(b)}}(b.getAllResponseHeaders),b.abort=function(a){return function(){return b.__fileApiXHR?b.__fileApiXHR.abort():null==a?null:a.apply(b)}}(b.abort),b.setRequestHeader=function(a){return function(c,d){if("__setXHR_"===c){var e=d(b);e instanceof Function&&e(b)}else a.apply(b,arguments)}}(b.setRequestHeader),b.send=function(){if(arguments[0]&&arguments[0].__isShim){var a=arguments[0],d={url:b.__url,complete:function(a,c){b.__load({type:"load",loaded:b.__total,total:b.__total,target:b,lengthComputable:!0}),Object.defineProperty(b,"status",{get:function(){return c.status}}),Object.defineProperty(b,"statusText",{get:function(){return c.statusText}}),Object.defineProperty(b,"readyState",{get:function(){return 4}}),Object.defineProperty(b,"response",{get:function(){return c.response}}),Object.defineProperty(b,"responseText",{get:function(){return c.responseText}}),b.__fileApiXHR=c,b.onreadystatechange()},progress:function(a){a.target=b,b.__progress(a),b.__total=a.total},headers:b.__requestHeaders};d.data={},d.files={};for(var e=0;e<a.data.length;e++){var f=a.data[e];null!=f.val&&null!=f.val.name&&null!=f.val.size&&null!=f.val.type?d.files[f.key]=f.val:d.data[f.key]=f.val}setTimeout(function(){b.__fileApiXHR=FileAPI.upload(d)},1)}else c.apply(b,arguments)},b}}(window.XMLHttpRequest),window.XMLHttpRequest.__isShim=!0),!window.FormData){var a=!1;try{var b=new ActiveXObject("ShockwaveFlash.ShockwaveFlash");b&&(a=!0)}catch(c){void 0!=navigator.mimeTypes["application/x-shockwave-flash"]&&(a=!0)}var d=function(b){if(!b.__isWrapped&&(null!=b.getAttribute("ng-file-select")||null!=b.getAttribute("data-ng-file-select"))){var c=document.createElement("div");c.innerHTML='<div class="js-fileapi-wrapper" style="position:relative; overflow:hidden"></div>',c=c.firstChild;var d=b.parentNode;d.insertBefore(c,b),d.removeChild(b),c.appendChild(b),a||c.appendChild(document.createTextNode("Flash is required")),b.__isWrapped=!0}},e=function(a){return function(b){var c=FileAPI.getFiles(b);b.target||(b.target={}),b.target.files=c,b.target.files.item=function(a){return b.target.files[a]||null},a(b)}},f=function(a,b){return("change"===b.toLowerCase()||"onchange"===b.toLowerCase())&&"file"==a.getAttribute("type")};HTMLInputElement.prototype.addEventListener&&(HTMLInputElement.prototype.addEventListener=function(a){return function(b,c,g,h){f(this,b)?(d(this),a.apply(this,[b,e(c),g,h])):a.apply(this,[b,c,g,h])}}(HTMLInputElement.prototype.addEventListener)),HTMLInputElement.prototype.attachEvent&&(HTMLInputElement.prototype.attachEvent=function(a){return function(b,c){f(this,b)?(d(this),a.apply(this,[b,e(c)])):a.apply(this,[b,c])}}(HTMLInputElement.prototype.attachEvent)),window.FormData=FormData=function(){return{append:function(a,b,c){this.data.push({key:a,val:b,name:c})},data:[],__isShim:!0}},function(){if(!window.FileAPI||!FileAPI.upload){var a,b,c,d="",e=document.createElement("script"),f=document.getElementsByTagName("script");if(window.FileAPI&&window.FileAPI.jsPath)d=window.FileAPI.jsPath;else for(a=0;a<f.length;a++)if(c=f[a].src,b=c.indexOf("angular-file-upload-shim.js"),-1==b&&(b=c.indexOf("angular-file-upload-shim.min.js")),b>-1){d=c.substring(0,b);break}window.FileAPI&&null!=FileAPI.staticPath||(FileAPI={staticPath:d}),e.setAttribute("src",d+"FileAPI.min.js"),document.getElementsByTagName("head")[0].appendChild(e)}}()}}();
\ No newline at end of file
diff --git a/angular-file-upload.js b/angular-file-upload.js
index 097c9cd..2717c2c 100755
--- a/angular-file-upload.js
+++ b/angular-file-upload.js
@@ -1,7 +1,7 @@
 /**!
  * AngularJS file upload/drop directive with http post and progress
  * @author  Danial  <danial.farid@gmail.com>
- * @version 1.2.2
+ * @version 1.2.3
  */
 (function() {
 	
@@ -66,6 +66,7 @@ angularFileUpload.service('$upload', ['$http', '$rootScope', '$timeout', functio
 		return promise;
 	};
 	this.upload = function(config) {
+		config.headers = config.headers || {};
 		config.headers['Content-Type'] = undefined;
 		config.transformRequest = config.transformRequest || $http.defaults.transformRequest;
 		var formData = new FormData();
diff --git a/angular-file-upload.min.js b/angular-file-upload.min.js
index 819f4ca..52b63e5 100755
--- a/angular-file-upload.min.js
+++ b/angular-file-upload.min.js
@@ -1,2 +1,2 @@
-/*! 1.2.2 */
-!function(){var a=angular.module("angularFileUpload",[]);a.service("$upload",["$http","$rootScope","$timeout",function(a,b,c){function d(b){b.method=b.method||"POST",b.headers=b.headers||{},b.transformRequest=b.transformRequest||function(b){return b instanceof ArrayBuffer?b:a.defaults.transformRequest[0](b)},window.XMLHttpRequest.__isShim&&(b.headers.__setXHR_=function(){return function(a){b.__XHR=a,a.upload.addEventListener("progress",function(a){b.progress&&c(function(){b.progress(a)})},!1),a.upload.addEventListener("load",function(a){a.lengthComputable&&c(function(){b.progress(a)})},!1)}});var d=a(b);return d.progress=function(a){return b.progress=a,d},d.abort=function(){return b.__XHR&&c(function(){b.__XHR.abort()}),d},d.then=function(a,c){return function(d,e,f){return b.progress=f||b.progress,c.apply(a,[d,e,f]),a}}(d,d.then),d}this.upload=function(b){b.headers["Content-Type"]=void 0,b.transformRequest=b.transformRequest||a.defaults.transformRequest;var c=new FormData;if(b.data)for(var e in b.data){var f=b.data[e];if(b.formDataAppender)b.formDataAppender(c,e,f);else{if("function"==typeof b.transformRequest)f=b.transformRequest(f);else for(var g=0;g<b.transformRequest.length;g++){var h=b.transformRequest[g];"function"==typeof h&&(f=h(f))}c.append(e,f)}}b.transformRequest=angular.identity;var i=b.fileFormDataName||"file";if("[object Array]"===Object.prototype.toString.call(b.file))for(var g=0;g<b.file.length;g++)c.append(i+g,b.file[g],b.file[g].name);else c.append(i,b.file,b.file.name);return b.data=c,d(b)},this.http=function(a){return d(a)}}]),a.directive("ngFileSelect",["$parse","$http","$timeout",function(a,b,c){return function(b,d,e){var f=a(e.ngFileSelect);d.bind("change",function(a){var d,e,g=[];if(d=a.target.files,null!=d)for(e=0;e<d.length;e++)g.push(d.item(e));c(function(){f(b,{$files:g,$event:a})})}),d.bind("click",function(){this.value=null})}}]),a.directive("ngFileDropAvailable",["$parse","$http","$timeout",function(a,b,c){return function(b,d,e){if("draggable"in document.createElement("span")){var f=a(e.ngFileDropAvailable);c(function(){f(b)})}}}]),a.directive("ngFileDrop",["$parse","$http","$timeout",function(a,b,c){return function(b,d,e){if("draggable"in document.createElement("span")){var f=a(e.ngFileDrop);d[0].addEventListener("dragover",function(a){a.stopPropagation(),a.preventDefault(),d.addClass(e.ngFileDragOverClass||"dragover")},!1),d[0].addEventListener("dragleave",function(){d.removeClass(e.ngFileDragOverClass||"dragover")},!1),d[0].addEventListener("drop",function(a){a.stopPropagation(),a.preventDefault(),d.removeClass(e.ngFileDragOverClass||"dragover");var g,h=[],i=a.dataTransfer.files;if(null!=i)for(g=0;g<i.length;g++)h.push(i.item(g));c(function(){f(b,{$files:h,$event:a})})},!1)}}}])}();
\ No newline at end of file
+/*! 1.2.3 */
+!function(){var a=angular.module("angularFileUpload",[]);a.service("$upload",["$http","$rootScope","$timeout",function(a,b,c){function d(b){b.method=b.method||"POST",b.headers=b.headers||{},b.transformRequest=b.transformRequest||function(b){return b instanceof ArrayBuffer?b:a.defaults.transformRequest[0](b)},window.XMLHttpRequest.__isShim&&(b.headers.__setXHR_=function(){return function(a){b.__XHR=a,a.upload.addEventListener("progress",function(a){b.progress&&c(function(){b.progress(a)})},!1),a.upload.addEventListener("load",function(a){a.lengthComputable&&c(function(){b.progress(a)})},!1)}});var d=a(b);return d.progress=function(a){return b.progress=a,d},d.abort=function(){return b.__XHR&&c(function(){b.__XHR.abort()}),d},d.then=function(a,c){return function(d,e,f){return b.progress=f||b.progress,c.apply(a,[d,e,f]),a}}(d,d.then),d}this.upload=function(b){b.headers=b.headers||{},b.headers["Content-Type"]=void 0,b.transformRequest=b.transformRequest||a.defaults.transformRequest;var c=new FormData;if(b.data)for(var e in b.data){var f=b.data[e];if(b.formDataAppender)b.formDataAppender(c,e,f);else{if("function"==typeof b.transformRequest)f=b.transformRequest(f);else for(var g=0;g<b.transformRequest.length;g++){var h=b.transformRequest[g];"function"==typeof h&&(f=h(f))}c.append(e,f)}}b.transformRequest=angular.identity;var i=b.fileFormDataName||"file";if("[object Array]"===Object.prototype.toString.call(b.file))for(var g=0;g<b.file.length;g++)c.append(i+g,b.file[g],b.file[g].name);else c.append(i,b.file,b.file.name);return b.data=c,d(b)},this.http=function(a){return d(a)}}]),a.directive("ngFileSelect",["$parse","$http","$timeout",function(a,b,c){return function(b,d,e){var f=a(e.ngFileSelect);d.bind("change",function(a){var d,e,g=[];if(d=a.target.files,null!=d)for(e=0;e<d.length;e++)g.push(d.item(e));c(function(){f(b,{$files:g,$event:a})})}),d.bind("click",function(){this.value=null})}}]),a.directive("ngFileDropAvailable",["$parse","$http","$timeout",function(a,b,c){return function(b,d,e){if("draggable"in document.createElement("span")){var f=a(e.ngFileDropAvailable);c(function(){f(b)})}}}]),a.directive("ngFileDrop",["$parse","$http","$timeout",function(a,b,c){return function(b,d,e){if("draggable"in document.createElement("span")){var f=a(e.ngFileDrop);d[0].addEventListener("dragover",function(a){a.stopPropagation(),a.preventDefault(),d.addClass(e.ngFileDragOverClass||"dragover")},!1),d[0].addEventListener("dragleave",function(){d.removeClass(e.ngFileDragOverClass||"dragover")},!1),d[0].addEventListener("drop",function(a){a.stopPropagation(),a.preventDefault(),d.removeClass(e.ngFileDragOverClass||"dragover");var g,h=[],i=a.dataTransfer.files;if(null!=i)for(g=0;g<i.length;g++)h.push(i.item(g));c(function(){f(b,{$files:h,$event:a})})},!1)}}}])}();
\ No newline at end of file