Symptoms

Using Portal AQccess the browser posts an error message in it's console similar to the following: Failed to execute 'postMessage' on 'Worker': No function was found that matched the signature provided.

Impact

Web-application misfunction

Conditions

Web-application contains javascript code which in turn contains postMessage() to worker with second argument which is array.

Workaround

Custom iRule workaround is possible. For example: # custom workaround for BZs 749142 for specific page when REWRITE_REQUEST_DONE { # path to html page where postMessage is used: if { [HTTP::path] ends_with "/custom_path" } { REWRITE::post_process 1 set sw 2222 } } when REWRITE_RESPONSE_DONE { if {[info exists sw] && $sw == 2222} { unset sw set strt [string first {</head>} [REWRITE::payload]] if {$strt > 0} { REWRITE::payload replace $strt 0 { <script> (function(){ var old_f5_ipm = F5_Invoke_postMessage; // BZ 749142: fix F5_Invoke_postMessage F5_Invoke_postMessage = function () { if ('string' === typeof arguments[2]) { return old_f5_ipm.apply(this, arguments) }else{ return Function.prototype.call.apply(arguments[0].postMessage,arguments); // call source function } } // just a hack to enable unzipped content of Worker for iRule processing (this is impossible for F5CH=I) F5_Invoke_Worker = function () { arguments[1] = F5_WrapURL(arguments[1],"h"); return new Worker(arguments[1]) } })(); </script> } } } }

Fix Information

The issue is fixed.

Behavior Change