How to send a URL request to a server without expecting a response back in Javascript

I am using a VoIP softswitch. In order to trigger a call I have to send the call parameters (user/pass/phone#) via http to a URL without be开发者_如何学JAVAing redirected to that URL. I tried JavaScript FORM with GET but I had no success.

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The request is not really relevant, the response is:

When the server responds with a 204 No Content (instead of the usual 200 OK), the browser stays on the original page. See e.g. this.

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You should use an asynchronous request (AJAX).

This is substantially easier if you use a framework that provides the facility, for instance jQuery. Or you can do it directly, find a good tutorial (example).