Usages of jQuery's ajax crossDomain property?

Question

According to jQuery :

crossDomain (default: false for same-domain requests, true for cross-domain requests) Type: Boolean If you wish to f

Answer 1

It isn't default false when missing. When missing it defaults to true if the domains are not the same (as in your first sample above). I think you can leave it to its default value in nearly if not all cases.

Also, when setting the cross-domain parameter, JQuery attempts to use CORS by default, not JSONP.

Here are some relevant snippets from JQuery source: https://github.com/jquery/jquery/blob/master/src/ajax/xhr.js

variable "xhrSupported"...

xhrSupported = jQuery.ajaxSettings.xhr();

..is used to check for CORS support....

support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );

.. which is checked when making AJAX calls....

jQuery.ajaxTransport(function( options ) {
        var callback;

        // Cross domain only allowed if supported through XMLHttpRequest
        if ( support.cors || xhrSupported && !options.crossDomain ) 

Hope this helps!