Avoid modifing request headers

src/webui/abstractwebapplication.cpp

@@ -387,7 +387,7 @@ bool AbstractWebApplication::isCrossSiteRequest(const Http::Request &request) co
                 && (left.host() == right.host()));
     };
 
-    const QString targetOrigin = request.headers.value(Http::HEADER_X_FORWARDED_HOST, request.headers[Http::HEADER_HOST]);
+    const QString targetOrigin = request.headers.value(Http::HEADER_X_FORWARDED_HOST, request.headers.value(Http::HEADER_HOST));
     const QString originValue = request.headers.value(Http::HEADER_ORIGIN);
     const QString refererValue = request.headers.value(Http::HEADER_REFERER);