simple_http crashes when given URL-encoding in URL

If you try to run simple_http on port 8080 and visit "127.0.0.1:8080/fap=432%424" it's going to crash. This is due to the overridden log_message which thinks the "%424" needs to turn into arguments in the "message % args" part of the log.

The solution can be to .replace("%", "%%") in log_request(), thus escaping the formatting.
(While I'm not versed in Python attacks, in C/C++ this would be a real vulnerability)

Find the simple_http entry point and inspect its overridden log_message and log_request methods. Reproduce the crash with a URL containing encoded percent characters such as 127.0.0.1:8080/fap=432%424, then verify that the request is logged without formatting errors and the server remains running.

Written by the indexing model from the issue text.