This has one argument - the path to the wsgi file. It accepts an HTTP request on stdin, supplies the response (with headers) on stdout, and errors go to stderr.
A large part of it is based on copy-pasting from the Python PEP-3333 page.
To see usage use the -h or --help option.
This is for troubleshooting and experimenting. Don't try and use it as a real server. That would be silly.