Describe the feature

I use requests-oauth to issue requests to a service. If service detects invalid token, it responds with HTTP 401 and header WWW-Authenticate: Bearer error="invalid_token", error_description="The access token expired"

I got the response and have to parse it by myself. I would like the oauthlib to fail with InvalidTokenError instead. (And similarly for other bearer errors in WWW-Authenticate).

See also:

• https://tools.ietf.org/html/rfc6750#section-3.1
• https://rnd.feide.no/2012/04/19/best-practice-for-dealing-with-oauth-2-0-token-expiration-at-the-consumer/

Additional context

OAuth 2.0 client