Add option to send client credentials (client_id and client_secret) in the header #122
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The RFC 6749 about OAuth 2.0 (https://tools.ietf.org/html/rfc6749#section-2.3.1) mentions the following:
"Including the client credentials in the request-body using the two
parameters is NOT RECOMMENDED and SHOULD be limited to clients unable
to directly utilize the HTTP Basic authentication scheme (or other
password-based HTTP authentication schemes). The parameters can only
be transmitted in the request-body and MUST NOT be included in the
request URI."
In order to be conform with this RFC, this pull request proposes to add an option "clientCredentials" which will send the client_id and client_secret in the Authorization header when the value is equal to "header".