[99s-extend] Cowboy REST Logic

[Phillips, Christopher]

  In 6.1, and still in 8.0, there is some logic that surprised me, and I wanted to see if it was intentional, or if I'm missing something.

  If I set up a POST such that it's a create, I get back a 303, rather than a 201, on successful create. This came as a bit of a surprise; I know from Webmachine, if it's a new resource being created, a POST will return a 201 (N11 to P11 in Webmachine's v3 diagram).

  Is this intentional? The logic seems to be post_is_create/2 -> create_path/2 -> put_resource/3 -> choose_content_type/5 -> next/3 -> respond(_, _, 303). It may be that this is a better response, rather than a 201 with the location header, but it came as a surprise given web machine's behavior.

  For background, I'm attempting to migrate some web machine code to Cowboy, which is serving a RESTful API to a Javascript client. The client is making CORS calls. Receiving a 303 and a Location header seemed to mean that the call was redirected before the client side code ever saw it (not sure what the browser was doing; I was expecting another request, but I wasn't quite lucid enough to check for that last night when working on it); a 201 allows me to examine the location.
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