bug: Allow UsageError exception to use more specific error code UsageError exception returned 400 error code but should return 405 when generated for a bad http method. Modified error handler to use 400 error code if self.response_code was less then 400. This should reproduce the standard error of 400 if one was not specified and preserve any other explicitly set response code. Also enhanced a test case to verify the 405 is returned.

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