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I am writing a web service that accepts only json, and also outputs only json.

So I need to return the appropriate status code if any other format is requested.

It appears that I have two choices:

  1. 406 - Not Acceptable
  2. 415 - Unsupported Media Type

It would be great if someone could enlighten me as to the semantics of the two codes.

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406 is returned by the server when it can't respond based on accepting the request headers (ie they have an Accept header which states they only want XML).

415 is returned by the server when the entity sent in a request (content in a POST or PUT) has an unsupported mediatype (i.e. they sent XML).

so.. 406 when you can't send what they want, 415 when they send what you don't want.

Hope that helps!


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