diff --git a/mix/HttpServer.cpp b/mix/HttpServer.cpp
index ba03d7795..fa09f51d0 100644
--- a/mix/HttpServer.cpp
+++ b/mix/HttpServer.cpp
@@ -156,7 +156,7 @@ void HttpServer::readClient()
 					//collect headers
 					int colon = l.indexOf(':');
 					if (colon > 0)
-						headers[l.left(colon)] = l.right(l.length() - colon - 1);
+						headers[l.left(colon).trimmed().toLower()] = l.right(l.length() - colon - 1).trimmed();
 				}
 				while (!(l.isEmpty() || l == "\r" || l == "\r\n"));
 
diff --git a/mix/qml/WebPreview.qml b/mix/qml/WebPreview.qml
index df14d0c4f..e4d0b61a5 100644
--- a/mix/qml/WebPreview.qml
+++ b/mix/qml/WebPreview.qml
@@ -185,8 +185,8 @@ Item {
 						content = fileIo.readFile(doc.path);
 				}
 
-				var accept = _request.headers["Accept"];
-				if (accept && accept.indexOf("text/html") >= 0 && !_request.headers["HTTP_X_REQUESTED_WITH"])
+				var accept = _request.headers["accept"];
+				if (accept && accept.indexOf("text/html") >= 0 && !_request.headers["http_x_requested_with"])
 				{
 					//navigate to page request, inject deployment script
 					content = "<script>web3=parent.web3;BigNumber=parent.BigNumber;contracts=parent.contracts;</script>\n" + content;