OPTIONS in PHP REST API

I'm writing a REST API in PHP and I can't find any resources explaining how to work with OPTIONS. It seems to be an important part of REST API's, that'开发者_开发技巧s about how much I've found.

Can anyone explain what OPTIONS should contain and how it should be formatted?

Thanks in advance.

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The HTTP OPTIONS method returns (at least) the HTTP methods that the server supports for a specific URL. Per example, if you have a resource (/user) where you can create, retrieve and retrieve headers (but not delete or update), OPTIONS should return the following response header:

Allow: GET,HEAD,POST

If you can delete the resource as well, it would be:

Allow: GET,HEAD,POST,DELETE

You get the idea.

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See section 9.2 http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html