jquery - Ajax request is not working when it called image handler -


my buttons click event handler this;

$(".imgrefreshcontact").click(function () {        $.ajax({              url: "/presentation/site/handlers/refreshcaptcha.ashx",              type: "post",              cache: false,              async: true,              success: function () { }             });        $("#imgcaptcha").attr('src', '/presentation/site/handlers/createcaptcha.ashx');  });

refreshcaptcha handler;

public void processrequest(httpcontext context)     {         context.session["captchametin"] = confirmcode.generaterandomcode();     }

createcapthca handler;

public void processrequest(httpcontext context)     {         confirmcode cc = new confirmcode(context.session["captchametin"].tostring(), 136, 36);          context.response.clear();         context.response.contenttype = "image/jpeg";          cc.image.save(context.response.outputstream, system.drawing.imaging.imageformat.jpeg);          cc.dispose();     }

when clicked img button, it's working perfect in chrome , firefox fails in ie 9 debugger enters refreshcaptcha handler not enters createcaptcha handler. so, ie makes ajax request once, not second time.

what problem ie , ajax request

use ie developer tools (f12) debug request. ie caches request , if don't change returns 304 status code (not modified). prevent this, add random query string parameter ajax call. like: 

url: "/presentation/site/handlers/refreshcaptcha.ashx?rnd=" + math.random()

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