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 http import cookies as Cookie
    from http.cookies import BaseCookie, CookieError, SimpleCookie
    from http.cookies import _getdate as get_cookie_date
except ImportError:
    # ruff: noqa: F401, PLC2701
    # Python 2.5-2.7
    from Cookie import BaseCookie, CookieError, SimpleCookie
    from Cookie import _getdate as get_cookie_date