This change adds the response body output when an error occurs. #22
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As is, if there is a problem with the auth flow, it's not obvious what the issue might be beyond a generic "400" error response. In our case the swallowed error was:
{"error":"invalid_grant","error_description":"The application's assurance requirements are not met by the 'subject_token'."}
This just adds that to the output.
This also does a small restructure to make sure we're closing the response body per golang guidelines.