如何在JavaScript中获取scripttag url标头值

Question

I have html page with script tag. In that script tag I am going to load external url, like..

<script src="http://www.test.com" />

Is it possible to read that url ( http://www.test.com ) header values by javascript.

Note: That script tag external url have iframe restriction.

Answer 1

If you are using a .js file, then it can't have Header values.

Normally you can get the Header values via JavaScript by using Ajax Request.

for example:

 var url = "www.test.com"; var rh; // Response Headers var xhr = new XMLHttpRequest(); xhr.open("GET",url,true); xhr.send(); xhr.onreadystatechange = function(){ if(xhr.status == 200 && xhr.readyState == 4){ rh = xhr.getAllResponseHeaders(); } } // now rh contain all headers //or you can make a HEAD request which return all HEADER elements of the URL xhr.open("HEAD", url,true); xhr.onreadystatechange=function() { if (xhr.readyState==4) { rh = xhr.getAllResponseHeaders(); } } xhr.send(null)