Accept Client ID Metadata Documents as client IDs - #284

string `https://10.0.0.1/x` has 2 occurrences, make it a constant (goconst)

string `https://app.example.com:8443/x` has 2 occurrences, make it a constant (goconst)

string `https://app.example.com/x` has 3 occurrences, make it a constant (goconst)

string `app.example.com` has 2 occurrences, make it a constant (goconst)

string `redirect_uris` has 2 occurrences, make it a constant (goconst)

string `application_type` has 2 occurrences, make it a constant (goconst)

string `client_id` has 3 occurrences, make it a constant (goconst)

string `localhost` has 2 occurrences, make it a constant (goconst)

string `http://localhost/callback` has 2 occurrences, make it a constant (goconst)

string `unittestclient` has 2 occurrences, make it a constant (goconst)

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