Never mind, I mistaken with the code of David Gilbertson (http Usually, this happens when you execute AJAX cross domain request using jQuery Ajax interface, Fetch API, or plain XMLHttpRequest.With simple words this mean that preflight request first send an HTTP request by the OPTIONS method to the resource on the remote domain, to make sure that the A password to be used with XMLHttpRequest in response to an HTTP access authentication request. processData (default: true).As of jQuery 1.5, jQuerys Ajax implementation includes prefilters, transports, and converters that allow you to extend Ajax with a great deal of flexibility. jQuery sets request headers under the covers so your back-end technology knows it is an Ajax request.You can see what this looks like when you fire HTTP Ajax requests: Tada! All with no drama.with XMLHttpRequest header function isXhr() return SERVER[HTTPX REQUESTEDWITH] XMLHttpRequestHow to Make a dropdown readonly using Jquery 09 Oct 2016. How to count number of key/value pairs in JSON Object 08 Oct 2016. Recommendjquery - c ajax post 400 bad request firefox only. . It works fine with IE and Google Chrome but it gives 400 bad request when I try toFor HTTP request methods that can cause side-effects on user data (in particular, for HTTP methods other than GET, or for POST usage with certain jQuery IFrame ajax transport (upload files via ajax emulation fallback).data-status-text (string) - HTTP response short description (see: HTTP Reason-Phrase).If the request was sent via IFrame, then further transferred POST parameter X-Requested-With IFrame (that param, not header!). So, if you include the X-Requested-WithXMLHttpRequest key-value pair as part of the HTTP POST like I am doing in the jQuery AJAX call, ASP.NET MVC will consider the HTTP Request as an AJAX HTTP Request. Im making an ajax request using jQuery and if the users session has expired the response that I get is a 302 moved. jQuery in that case is making another request to the new path which is the login page. This time we will use parts from that tutorial together with some jQuery Ajax requests to show our photo search result without reloading the web page.search url.httpbuildquery(args) result this->filegetcontentscurl(search) There are a couple ways to initiate a GET ajax request using jQuerys API. One involves the get method, which is shorthand for ajax with a type of get. Well just use the ajax method going forward for consistency. Anyway, I encountered some quite interesting behavior of IE with jQuery Ajax calls and cached responses. HTTP/1.1 304 Not Modified: No Way! You Wont Catch Me. To have this experiment work, ensure you have your browser caches active. Take the following ajax request to a static JSON file. A jQuery plugin to allow Cross Origin AJAX requests with no need to write a local proxy.CORS is a W3C recommendation and supported by all major browsers. It makes use of HTTP headers to help browser decide if a cross-domain AJAX request is secure.