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copied!<p>This OPTIONS request is the CORS preflight request. It is a request that is sent to the server before the actual request in order to ask permissions to make the request. The custom Content-Type is in fact triggering the preflight. According to the CORS spec (<a href="http://www.w3.org/TR/cors/" rel="noreferrer">http://www.w3.org/TR/cors/</a>), any Content-Type <em>other</em> than application/x-www-form-urlencoded, multipart/form-data, or text/plain triggers the preflight.</p> <p>If you have no control over the remote server, then you'll need to either ask them to support CORS preflight, or try some other option such as JSON-P.</p> <p>If you do have control over the remote server, you can change it to handle preflights. In order to handle a preflight request, you should send the following headers in the response to the OPTIONS request:</p> <pre><code>Access-Control-Allow-Origin: * Access-Control-Allow-Methods: POST Access-Control-Allow-Headers: Content-Type </code></pre> <p>The response should be an HTTP 200. The <code>Access-Control-Allow-Methods</code> response header can either echo the value of the <code>Access-Control-Request-Method</code>, or it can just be <code>GET, POST, PUT, DELETE</code> to support all methods. The <code>Access-Control-Allow-Headers</code> response header should echo the values in the <code>Access-Control-Request-Headers</code> request header. </p> <p>Once the browser receives those headers, it will make the actual request. You can learn more about CORS preflight requests here:</p> <p><a href="http://www.html5rocks.com/en/tutorials/cors/" rel="noreferrer">http://www.html5rocks.com/en/tutorials/cors/</a></p>

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