http headers with the help of javascript?

How to se开发者_C百科nd http headers with the help of javascript?

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Sure.

var xhr = new XMLHttpRequest();
xhr.open("POST", "/path/to/script", false);
xhr.setRequestHeader("Content-Type", "text/xml");
xhr.send(strUrlEncodedPostVariables);

Be careful though. IE 5, 5.5 and 6 didn't support the XMLHttpRequest object, so you had to use new ActiveXObject() and the implementation was wonky (but worked). I don't recall how you set headers in the ActiveXObject implementation (I think it was the same), but I remember it did allow it. Strangely, the Wikipedia article on XHR is the easiest place to read up on this.