Added workaround for Firefox not sending LINK in uppercase what then is denied by nginx.

More info: http://stackoverflow.com/questions/9645037/nginx-rejects-custom-http-methods-if-not-all-upper-case

Resources/views/layout.html.twig

@@ -386,6 +386,12 @@
                         endpoint = $('#api_endpoint').val();
                     }
 
+                    // Workaround for Firefox bug and a thereby resulting nginx incompatibility
+                    if (method == "LINK") {
+                        method = "POST";
+                        params._method = "LINK";
+                    }
+
                     // prepare final parameters
                     var body = {};
                     if(bodyFormat == 'json' && method != 'GET') {