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    <p>POST does not support a 'lookup or create' approach. The server cannot tell the client "I would create that, but it already existed. Look here for the existing entry". None of the 2xx codes work because the request is not successful. None of the 3xx codes work, because the intention is not to redirect the POST to a new resource. And 303 is also not appropriate since nothing changed (see 303 spec).</p> <p>What you could do is provide a form or template to the client to be used with PUT that tells the client how to construct the PUT URI. If the PUT results in a 200 the client knows the resource existed and if 201 is returned that a new resource has been created.</p> <p>For example:</p> <p>Template for URI: <a href="http://service/items/" rel="nofollow noreferrer">http://service/items/</a>{key}</p> <blockquote> <p>PUT <a href="http://service/items/456" rel="nofollow noreferrer">http://service/items/456</a></p> <p>[data]</p> <p>201 Created</p> </blockquote> <p>or </p> <blockquote> <p>PUT <a href="http://service/items/456" rel="nofollow noreferrer">http://service/items/456</a></p> <p>[data]</p> <p>200 Ok</p> </blockquote> <p>You can also do a 'create but do not replace if exists' using If-None-Match:</p> <pre><code> PUT http://service/items/456 If-None-Match: * [data] 412 Precondition failed </code></pre> <p>Jan</p>
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    1. POWhich HTTP redirect status code is best for this REST API scenario?
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    1. USJan Algermissen
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    1. COI surprised that you would not see this as just another "creative" way to use HTTP. I'm assuming you don't have a problem with case 1. For case 2 if you assume that the resource is a "data processing" resource, then I don't see a problem with doing POST that returns 303. Is the problem that the client is using the same resource for both scenarios?
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      1. USDarrel Miller
    2. COPUT is meant to be used when you know the URI of the resource. In this case, the client does not know the final URI of the resource. (Did you miss my mention that the client doesn't know the key, e.g. 456, in advance? The server decides the key.) POST also doesn't require state changes on the server. It means there *might* be state changes on the server. I'll try to dig up places where I've read this. Regardless, I appreciate your comments, but this is also a case to me where the simplicity of POST here by far outweighs the possible slightly better semantics of PUT + If-None-Match.
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      1. USAseem Kishore
    3. COHere's an article that confirms my point: http://jcalcote.wordpress.com/2008/10/16/put-or-post-the-rest-of-the-story/ "Create = POST if you are sending a command to the server to create a subordinate of the specified resource, using some server-side algorithm." / "Create can be implemented using an HTTP PUT, if (and only if) the payload of the request contains the full content of the exactly specified URL." / "POST operations may or may not result in additional directly accessible resources."
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