diff --git a/README.md b/README.md
index 4b2b786..dd32978 100644
--- a/README.md
+++ b/README.md
@@ -88,6 +88,7 @@ A javascript library providing server defined loading of assets for a single pag
  * server.timeout = The timeout to download the server resources. (default: 4096)
  * server.flag = The window flag which is set when the server.url is know. (default: 'FFServerUrl')
  * server.header.request = An key value object with the request headers. (default: {'X-FFSpaLoader': 'sync'})
+ * server.header.response = An key value object with the required response headers. (default: {})
  * question.transport = The transport to prefix the server.url with. (default: 'http://')
  * question.title = The question ui title. (default: 'Server')
  * question.submit = The start button text. (default: 'Start')
@@ -198,7 +199,6 @@ A javascript library providing server defined loading of assets for a single pag
 ## Todo
 
  * test in production
- * Server header check support
  * Add instance websql options so it can also be used in application code.
  * Split assets per type so do js first then boot then css + cssData.
  * Add more tests
@@ -215,10 +215,11 @@ Add unit tests for any new or changed functionality. Lint and test your code.
 ## Release History 
 
 ### 0.2.0
-* Dropped error.style and question.style for css file.
+* Moved error.style and question.style to css file.
 * Change dist with extra css/js folder.
 * Added loader progress bar.
 * refined css so question/loader/error are equal.
+* Added response header check support.
 
 ### 0.1.1
 * Moved websql delete timeout to cleanServerlUrl for faster boot.
diff --git a/es5-ff-spa-loader.js b/es5-ff-spa-loader.js
index 468978d..eb74cd1 100644
--- a/es5-ff-spa-loader.js
+++ b/es5-ff-spa-loader.js
@@ -74,7 +74,7 @@
 				request: {
 					'X-FFSpaLoader': 'sync'
 				},
-				response: { // TODO: add header check support
+				response: {
 				}
 			}
 		},
@@ -336,6 +336,23 @@
 		httpRequest.onreadystatechange = function() {
 			if (httpRequest.readyState === 4 && httpRequest.status === 200) {
 				utilDebug('utilHttpFetch url \"'+url+'\" done in '+(new Date().getTime()-startTime)+' ms.');
+				
+				var headerResponseKeys = Object.keys(options.server.header.response);
+				for (var headerResponseKeyIdx in headerResponseKeys) {
+					var headerResponseKey = headerResponseKeys[headerResponseKeyIdx];
+					var headerResponseValue = options.server.header.response[headerResponseKey];
+					var value = httpRequest.getResponseHeader(headerResponseKey);
+					if (value === null) {
+						return cb('Header missing: '+headerResponseKey);
+					}
+					if (headerResponseValue === null) {
+						continue;
+					}
+					if (headerResponseValue !== value) {
+						return cb('Header mismatch: '+headerResponseKey);
+					}
+				}
+				
 				cb(null, httpRequest);
 			} else if (httpRequest.readyState === 4) {
 				cb('Wrong status '+httpRequest.status);
@@ -602,7 +619,7 @@
 		var stepProgres10 = 0;
 		
 		var createUITimeout = setTimeout( function () {
-			utilDebug('createLoaderBar');
+			utilDebug('createLoaderBar after timeout: '+options.loader.await);
 			
 			rootTag = document.createElement('div');
 			rootTag.setAttribute('class','ffWrapper');
@@ -746,10 +763,8 @@
 			
 			var progressBar = createLoaderBar(resources);
 			var loadResourceStep = function (resource, cb) {
-				//setTimeout(function() {
 				loadResource(resource,cb);
 				progressBar.nextResource(resource);
-				//}, 1000);
 			}
 			
 			if (cacheHasService('meta')) {
@@ -819,10 +834,9 @@
 		var resourcesUrl = options.server.url + options.server.assets;  
 		utilDebug('askUrlStart check assets '+resourcesUrl);
 		
-		// TODO: check headers
 		utilHttpFetch(resourcesUrl,function(err, httpRequest) {
 			if (err !== null) {
-				inputErrorTag.appendChild(document.createTextNode('Error could not get data.'));
+				inputErrorTag.appendChild(document.createTextNode('Error '+err));
 				return;
 			}
 			if (httpRequest.responseText.length === 0) {
diff --git a/example/app_mobile/www/index.html b/example/app_mobile/www/index.html
index c232cbe..7057e77 100644
--- a/example/app_mobile/www/index.html
+++ b/example/app_mobile/www/index.html
@@ -15,6 +15,7 @@
 			FFSpaLoader.options.debug.enable = true;
 			FFSpaLoader.options.boot.angular.modules.push('exampleUI');
 			FFSpaLoader.options.server.assets = '/static/spa-client-resources';
+			FFSpaLoader.options.server.header.response['X-My-Api'] = 'noknok';
 			FFSpaLoader.start();
 		</script>
     </body>
diff --git a/example/app_server/example.js b/example/app_server/example.js
index b211e63..7cfe5bf 100644
--- a/example/app_server/example.js
+++ b/example/app_server/example.js
@@ -104,6 +104,7 @@ server.use(morgan('dev'));
 server.use(cors({credentials: true, origin: '*'}));
 server.set('view engine', 'ejs');
 server.set('views',                                       path.join(__dirname,'www_views'));
+server.use(function(req, res, next) {      res.header('X-My-Api', 'noknok');next(); });
 server.use('/static',                      express.static(path.join(__dirname,'www_static')));
 server.use('/static/module/bootstrap',     express.static(path.join(__dirname,'../node_modules/bootstrap/dist')));
 server.use('/static/module/jquery',        express.static(path.join(__dirname,'../node_modules/jquery/dist')));
diff --git a/example/app_server/www_views/index.ejs b/example/app_server/www_views/index.ejs
index 15bc3bb..d4508a6 100644
--- a/example/app_server/www_views/index.ejs
+++ b/example/app_server/www_views/index.ejs
@@ -11,6 +11,7 @@
 			FFSpaLoader.options.debug.enable = true;
 			FFSpaLoader.options.boot.angular.modules.push('exampleUI');
 			FFSpaLoader.options.server.assets = '/static/spa-client-resources';
+			FFSpaLoader.options.server.header.response['X-My-Api'] = 'noknok';
 			FFSpaLoader.start();
 		</script>
 	</body>