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PORead the absolute redirected SRC attribute URL for an image
 

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  1. PORead the absolute redirected SRC attribute URL for an image
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    <p>I'm using the Twitter avatar API to fetch a user's avatar URL on the client-side, and I'd like to cache the response, but instead of a regular JSON (or indeed, any other type), they just issue a 302 redirect.</p> <p>This doesn't work (because it's cross domain):</p> <pre><code>jQuery.getJSON('https://api.twitter.com/1/users/profile_image/60173.json', function(data, status, jqxhr){ console.log("data: ", data); console.log("status: ", status); console.log("jqxhr: ", jqxhr); console.log(jqxhr.getResponseHeader('Location')); console.log(jqxhr.getAllResponseHeaders()); }) </code></pre> <p>Data is empty, status is 'success', jqhxr returns a jqxhr object, but the getResponseHeader() and getResponseHeaders() are null because it's a cross-domain call rather than a true XMLHTTP call.</p> <p>So I thought I might be able to use the load() event to show the actual url of the image after the 302 had happened. I tried this:</p> <pre><code>function avatar_loaded(img) { console.log("We loaded an avatar for %s (img)[0].src is %o attr('src') is %o getAttribute('src') is %o", img, jQuery(img)[0].src, jQuery(img).attr('src'), img.getAttribute("src")); } var avatar_url = "https://api.twitter.com/1/users/profile_image/60173"; jQuery('body').append("&lt;img onload='avatar_loaded(this)' src='" + avatar_url + "' width='0' height='0'&gt;"); </code></pre> <p>You'll see that the avatar_loaded function gets called twice. Once with the initial img src (https://api.twitter.com/1/users/profile_image/60173) and then again, presumably with the 302ed actual image url <a href="http://a1.twimg.com/profile_images/1272489576/Photo_38_normal.jpg" rel="nofollow">http://a1.twimg.com/profile_images/1272489576/Photo_38_normal.jpg</a></p> <p>But I can't read the redirected absolute URL no matter what I try. Any other ideas?</p> <p><strong>EDIT:</strong> I Didn't want this to turn into a time-sink, so I just used the</p> <pre><code>http://api.twitter.com/1/users/show.json?user_id= </code></pre> <p>API call. I'd imagined that this would require an authenticated call for protected users, it doesn't so it's fine to use.</p>
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    1. COit gets called twice but with the same src: http://jsfiddle.net/ionutzp/6Ekub/
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