Catch the error before the response is processed by goth (#20000) #20102
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The code introduced by #18185 gets the error from response after it was processed by goth. That is incorrect, as goth (and golang.org/x/oauth) doesn't really care about the error, and it sends a token request with an empty authorization code to the server anyway, which always results in a `oauth2: cannot fetch token: 400 Bad Request` error from goth. It means that unless the "state" parameter is omitted from the error response (which is required to be present, according to [RFC 6749, Section 4.1.2.1](https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.2.1)) or the page is reloaded (makes the session invalid), a 500 Internal Server Error page will be displayed. This fixes it by handling the error before the request is passed to goth.
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Backport #20000
The code introduced by #18185 gets the error from response after it was processed by goth.
That is incorrect, as goth (and golang.org/x/oauth) doesn't really care about the error, and it sends a token request with an empty authorization code to the server anyway, which always results in a
oauth2: cannot fetch token: 400 Bad Requesterror from goth.It means that unless the "state" parameter is omitted from the error response (which is required to be present, according to RFC 6749, Section 4.1.2.1) or the page is reloaded (makes the session invalid), a 500 Internal Server Error page will be displayed.
This fixes it by handling the error before the request is passed to goth.