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POXMLHTTPRequest response doesnt contain Location field in the header
 

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  1. POXMLHTTPRequest response doesnt contain Location field in the header
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    <p>I was trying to modify the adblockplus code for testing purpose. I was modifying the code to send a http get request on a URL and get the final URL from the response. I tried using the below code, but the response doesn't contain the Location field in the header response. I am doing this within a firefox-extension, so I dont think cross-domain request would be any issue. Why is it that I am not able to fetch the Location field from the response? Is there a better way to accomplish this task ?</p> <p>Input URL- <a href="http://netspiderads3.indiatimes.com/ads.dll/clickthrough?msid=17796167&amp;cid=3224&amp;slotid=1203&amp;nsRndNo=817685688" rel="nofollow">http://netspiderads3.indiatimes.com/ads.dll/clickthrough?msid=17796167&amp;cid=3224&amp;slotid=1203&amp;nsRndNo=817685688</a></p> <p>Expected output-<a href="http://www.mensxp.com/" rel="nofollow">http://www.mensxp.com/</a></p> <p>Actual Output- Location: null</p> <p>Here is the code I am using-</p> <pre><code>function geturl(url){ let req= Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest); req.open("GET", url); req.overrideMimeType("text/plain"); req.send(null); req.onreadystatechange = function() { if (req.readyState == 4) { if (req.status == 200) { try { location = req.getResponseHeader("Location"); console.log("Location is: " + location); } catch(e){ console.log("Error reading the response: " + e.toString()); } } } </code></pre> <p><strong>Solution</strong>-</p> <p>I finally found the solution for this. I was not getting the final response. So I set the redirection limit to 0, now I can get the Location field in the header. Here is what I added to my code-</p> <pre><code>if (request.channel instanceof Ci.nsIHttpChannel) request.channel.redirectionLimit = 0; </code></pre>
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    1. USLalit Agarwal
    1. USLalit Agarwal
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