C# unsupported grant type when calling web api

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The default implementation of OAuthAuthorizationServerHandler only accepts form encoding (i.e. application/x-www-form-urlencoded) and not JSON encoding (application/JSON).

Your request’s ContentType should be application/x-www-form-urlencoded and pass the data in the body as:

grant_type=password&username=Alice&password=password123

i.e. not in JSON format.

The chrome example above works because it is not passing data as JSON. You only need this for getting a token; for other methods of your API you can use JSON.

This kind of problem is also discussed here.

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