invalid_grant
status code should be 400
#561
Merged
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According to section 5.2 of rfc 6749
(https://tools.ietf.org/html/rfc6749#section-5.2)
A server should respond with 400 in case of an invalid grant. The
given grant is invalid and the client should give other data.
A 401 is not applicable here because the client is required to give
suitable Authorization header field which doesn't make any sense if
you are trying to acquire a grant authentication.
According to sections 10.4.1 and 10.4.2 of rfc 2616
(https://tools.ietf.org/html/rfc2616#section-10.4.1)
WIP: these changes breaks downstream libs tests: