we already required an extra argument inside the headers sent
for 401 and 407 error responses, move those to sent_http_error_message()
and refactor send_http_headers() to always take the extra argument.
in calling sites where the extra arg isn't needed, use "".
another fallout of the config refactoring finished by
2e02dce0c3.
apparently no one using the ErrorFile directive used git master
during the last months, as there have been no reports about this issue.
rofl0r
Michael Adam
Mukund Sivaraman