That error message seems to just be Google's default 500 error message page; even when it is an API request that fails, even if the API is specified to return errors as some kind of JSON or XML, you get that HTML page in response. (I know this as Google's OpenID+OAuth pipeline has been failing occassionally for the last month, something I've been trying to get them to fix on the Google Federated Login API mailing list.)
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That error message seems to just be Google's default 500 error message page; even when it is an API request that fails, even if the API is specified to return errors as some kind of JSON or XML, you get that HTML page in response. (I know this as Google's OpenID+OAuth pipeline has been failing occassionally for the last month, something I've been trying to get them to fix on the Google Federated Login API mailing list.)