OAuth 2 "errorType":"invalid_request","message":"Redirect_uri mismatch

[Bater]

Hi everyone

I am following OAuth 2.0 tutorial page and choose Authorization Code flow.

Because we don't have URI yet so I set http://localhost:8000 as Redirect URI.

Even I change to http://example.com/auth, but get the same error message.

When I get Code and try to run "1A Get Code" by Hurl.it, I always get error as title:

{"errors":[{"errorType":"invalid_request","message":"Redirect_uri mismatch: http%3A%2F%2Flocalhost%3A8000. Visit https://dev.fitbit.com/docs/oauth2 for more information on the Fitbit Web API authorization process."}],"success":false}

Does anyone can give me some advice?

Thanks a lot.