How to know mime-type or content-type of current loaded page via JavaScript?

Question

Possible Duplicate:
Accessing HTTP Headers in Javascript?

I want know a mime-type or content-type of current loaded page via JavaScript. the thing I wanna do is to check whether it is rss or html of the page.

The only thing I could find is 'document.contentType', but it is supported in Gecko ( firefox ).

does anyone know how to do it via JavaScript ?

Answer 1

Use an XHR request.

var xhr = new XMLHttpRequest();
xhr.open('GET', document.location, false);
xhr.send(null);

alert(xhr.getResponseHeader("content-type"));​ // content-type

1. Initialise the request
2. Send the request
3. Get the desired header using ref.getResponseHeader()

Also check out the links below.

• Accessing the web page's HTTP Headers in JavaScript
• Getting header information inside JavaScript
• http://www.w3.org/TR/XMLHttpRequest/#the-getresponseheader-method