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.

try:
    # Python 3+
    from urllib.parse import parse_qs, quote, unquote, urlencode, urlparse, urlsplit, urlunparse
    from urllib.request import urlopen
except ImportError:
    # Python 2.5-2.7
    from urllib import quote, unquote, urlencode  # noqa: F401

    from urllib2 import urlopen  # noqa: F401
    from urlparse import parse_qs, urlparse, urlsplit, urlunparse  # noqa: F401