Introspection responds to invalid requests appropriately #127
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This PR changes the error handling behavior of the introspection handlers to return information to clients informing them when a request is invalid. Since this behavior is more expected and as far as I can tell the OAuth 2 introspection specification [1] doesn't specify what to do in the case of an invalid request, and I don't see a reason to obscure this case.
[1] https://tools.ietf.org/html/rfc7662#section-2.3