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POCORS GET returns an empty response body in Firefox
 

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  1. POCORS GET returns an empty response body in Firefox
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    <p>From a RESTful Backbone application, I'm doing CORS requests from <code>mydomain.com</code> to <code>myExtdomain.com</code>.</p> <p>I <em>did</em> set up CORS on my <code>myExtdomain.com</code> server, I'm responding to <code>OPTIONS</code> verb (any URL) with:</p> <pre><code>Access-Control-Allow-Origin: * Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE Access-Control-Allow-Headers: Content-Type Status Code: HTTP/1.1 204 No Content </code></pre> <p>And to my API calls on <code>myExtdomain.com</code> with:</p> <pre><code>Access-Control-Allow-Origin: * Content-Type: application/json Status Code: HTTP/1.1 200 OK </code></pre> <p>I even desperately tried to respond to <em>all</em> my HTTP requests on <code>myExtdomain.com</code> with everything:</p> <pre><code>Access-Control-Allow-Origin: * Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE Access-Control-Allow-Headers: Content-Type Content-Type: application/json Status Code: HTTP/1.1 200 OK </code></pre> <h2>The problem</h2> <ul> <li>Everything works fine in Chrome</li> <li>In Firefox, my <code>PUT</code> requests work, but my <code>GET</code> requests "kinda fail"...</li> </ul> <h2>"Kinda fail" definition</h2> <ul> <li>The returned HTTP status code is <code>200 OK</code></li> <li>But the response is empty (No Response Body/Size 0 KB).. It supposed to be some <code>JSON</code>.</li> <li>But, for some reason, every once in 100 times, one <code>GET</code> request works</li> </ul> <h2>The boring details a.k.a "The Headers"</h2> <p>Responding to <code>OPTIONS</code> verb:</p> <pre><code>REQUEST HEADERS ----------------- User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:25.0) Gecko/20100101 Firefox/25.0 Origin: http://mydomain.com Host: www.myExtdomain.com Connection: keep-alive Access-Control-Request-Method: PUT Access-Control-Request-Headers: content-type Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 RESPONSE HEADERS ----------------- X-Powered-By: ASP.NET Server: Microsoft-IIS/7.0 Date: Fri, 15 Nov 2013 07:01:57 GMT Content-Type: text/html Access-Control-Allow-Origin: * Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE Access-Control-Allow-Headers: Content-Type </code></pre> <p>A <code>PUT</code> request:</p> <pre><code>REQUEST HEADERS ---------------- User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:25.0) Gecko/20100101 Firefox/25.0 Referer: http://mydomain.com/account Origin: http://mydomain.com Host: www.myExtdomain.com Content-Type: application/json; charset=UTF-8 Content-Length: 36 Connection: keep-alive Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Accept: application/json, text/javascript, */*; q=0.01 RESPONSE HEADERS ---------------- X-Powered-By: ASP.NET Server: Microsoft-IIS/7.0 Date: Fri, 15 Nov 2013 07:01:57 GMT Content-Type: application/json Content-Length: 0 Access-Control-Allow-Origin: * BODY RESPONSE -------------- _Some_Json_Here_ </code></pre> <p>The <em>magic</em> <code>GET</code> request:</p> <pre><code>REQUEST HEADERS ---------------- User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:25.0) Gecko/20100101 Firefox/25.0 Referer: http://mydomain.com/somepage Origin: http://mydomain.com Host: www.myExtdomain.com Connection: keep-alive Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Accept: application/json, text/javascript, */*; q=0.01 RESPONSE HEADERS ---------------- Server: Microsoft-IIS/7.0 Last-Modified: Fri, 15 Nov 2013 06:58:18 GMT Date: Fri, 15 Nov 2013 07:01:57 GMT Content-Type: application/json Content-Length: 4041 Connection: keep-alive RESPONSE BODY -------------- Empty (0KB), it's supposed to be some JSON, that *SOMETIMES* (1/100) I get.. Magic. </code></pre> <h2>Closing thoughts</h2> <ul> <li>As you can see the Response Headers of the magic <code>GET</code> request do not even include the CORS Headers I do set on <code>myExtdomain.com</code></li> <li>The <code>PUT</code> request on the other hand does include them..</li> <li>Again, everything works just fine in Chrome, all the Response Headers are present, I get my <code>JSON</code> as expected, etc..</li> <li>I spent a rather long time <a href="https://developer.mozilla.org/en-US/docs/HTTP/Access_control_CORS">studying</a> <a href="http://www.html5rocks.com/en/tutorials/cors/">CORS</a> (was not enough apparently), trying to break down what's needed/not needed and not copy/pasting random code</li> <li><code>JSONP</code> for <code>GET</code> requests is <em>not</em> an alternative for me</li> <li>All my requests (any verb) are made from non-secure pages (<em>not</em> from <code>https://</code>)</li> <li>I'm desperate..</li> </ul>
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    1. COfor your get request, is content-length non-zero every time? or it's non-zero sometimes (1/100) also?
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    2. COIt's non-zero sometimes (1/100). So 0 KB most of the times (99/100). Basically everything is working as expected _only_ 1/100 times.
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