I tried so many tutorials online but everything I try is really old and fails - I can't even create an XMLHTTPRequest object!
I just want to get the header from google.com - how can I do that?
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1Making a request to google is going to violate the cross host restriction. You cannot request a page on a hostname other than your site's. (Though you can do so in round about ways -- just not with a XMLHTTPRequestObject.)Corbin– Corbin2012-03-06 01:38:59 +00:00Commented Mar 6, 2012 at 1:38
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"Really old"? What have you tried? What "tutorials"? Which actual, proper, peer-reviewed books are you using?Lightness Races in Orbit– Lightness Races in Orbit2012-03-06 01:45:14 +00:00Commented Mar 6, 2012 at 1:45
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2 Answers
You would use xhr.getResponseHeader() to get a single header, or xhr.getAllResponseHeaders() to read all of the headers from an XMLHttpRequest response.
The reasons this won't work for you:
XMLHttpRequestis case sensitive. If you are usingHTTPin all caps, it will fail.- Unless you are a google employee adding code to google.com, your request falls victim to the same origin policy. You'll have to use your server as a proxy to get headers from a google request.
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You cant simply do this by JS. You'll have to use AJAX and do a server request to PHP,ASP, Java or whatever. The XMLHTTPRequest should do it - if you really want to do it manually. But it will really not work with foreign domains, so you are forced to do the XMLHTTTPRequest to a page on your server which will deliver the header.
