def _authorize_credentials(self):
try:<EOL><INDENT>http = self.credentials.authorize(httplib2.Http())<EOL>self.service = discovery.build("<STR_LIT>", "<STR_LIT>", http=http)<EOL>return True<EOL><DEDENT>except ServerNotFoundError:<EOL><INDENT>return False<EOL><DEDENT>
Fetches an access/refresh token by authorizing OAuth 2.0 credentials.

Returns: True, if the authorization was successful.
         False, if a ServerNotFoundError is thrown.