jquery - Browser returning HTTP 200 with an empty responseText -

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i use following code retry operations return http 502, 503 or 504:

/**  * @function retrydelayfunction  * returns amount of time wait after failure.  *  * @param {number} retries number of times operation has been retried  * @return {number} number of milliseconds wait before retrying operation  */  /**  * @typedef {object} retryajaxoptions  *  * @property {number} retries number of times retry failed operation  * @param {retrydelayfunction} delayfunction maps failure count delay in milliseconds  * @param {array} errorcodes http response codes should trigger retry  */  /**  * retries http requests using exponential back-off in case of http 502, 503, 504. based on  * https://github.com/execjosh/jquery-ajax-retry , http://javadoc.google-http-java-client.googlecode.com/hg/1.15.0-rc/com/google/api/client/util/exponentialbackoff.html  *  * $.ajax() settings object must contain {@code retry} key enable functionality.  * object of type {@link retryajaxoptions} , may used override default behavior.  */ function installajaxretries() {     "use strict";     /**      * nothing.      */     var noopfunction = function()     {     };      var delayinitialintervalms = 250;     var delayintervalmultiplier = 1.5;     var delayrandomizationfactor = 0.5;      /**      * @function retrydelayfunction      */     var defaultdelayfunction = function(retries)     {         var retryinterval = delayinitialintervalms * math.pow(delayintervalmultiplier, retries);         var delta = retryinterval * delayrandomizationfactor;         var min = retryinterval - delta;         var max = retryinterval + delta;         return (math.random() * (max - min + 1)) + min;     };      var min_retries = 1;     var default_retries = 3;     var default_error_codes = [502, 503, 504];      var default_options =         {             retries: default_retries,             delayfunction: defaultdelayfunction,             errorcodes: default_error_codes         };     var originalajaxfunction = $.ajax;     var ajaxwithretry = function(settings)     {         settings = $.extend(true, {}, $.ajaxsettings, settings);         if (!settings.retry)             return originalajaxfunction(settings);          var retries = 0;         var options = $.extend(true, {}, $.ajaxretrysettings, settings.retry);         var originalerrorfunction = settings.error || noopfunction;         var originalcompletefunction = settings.complete || noopfunction;          // clamp options         options.retries = math.max(min_retries, options.retries);         options.delayfunction = options.delayfunction || defaultdelayfunction;          // override error function         settings.error = function(xhr, textstatus, errorthrown)         {             if ($.inarray(xhr.status, options.errorcodes) < 0 || retries >= options.retries)             {                 // give , call original error() function                 originalerrorfunction.call(this, xhr, textstatus, errorthrown);                 return;             }             // complete() handler retry operation         };          // override complete function         settings.complete = function(xhr, textstatus)         {             if ($.inarray(xhr.status, options.errorcodes) < 0 || retries >= options.retries)             {                 // give , call original complete() function                 originalcompletefunction.call(this, xhr, textstatus);                 return;             }             var delayms = options.delayfunction(retries);             ++retries;             window.settimeout(function()             {                 originalajaxfunction(settings);             }, delayms);         };          originalajaxfunction(settings);         return settings.xhr;     };      var ajaxretrysetup = function(options)     {         default_options = $.extend(true, default_options, options);         $.ajaxretrysettings = default_options;         return default_options;     };      $.ajaxretrysettings = default_options;     $.ajaxretrysetup = ajaxretrysetup;     $.ajax = ajaxwithretry; } installajaxretries();

ever since started using code, ajax calls began returning http 200 empty responsetext. what's weird first request failing (no retrying taking place) , commenting out code overrides settings.complete fixes problem. using chrome 29.0.1547.57 m.

why overriding settings.complete cause problem?

update: control server, know fact never returns http 200 empty response.

update2: can no longer reproduce problem , don't recall did fix it. if can't reproduce in next couple of months plan on closing it.

may trying cross domain server.set response header allow-access-origin


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