SCRIPT_NAME and PATH_INFO for root CGI scripts and Plack::Handler::CGI

[miyagawa]

when you alias all of your requests, at / and anything below it, as one CGI script, Apache sets everything in the path as SCRIPT_NAME and empty "" to PATH_INFO, which is not useful for Plack::Handler::CGI to figure out what the root URL path is.

It could be "fixed" either with a complex Apache config, or by introducing middleware that swaps SCRIPT_NAME and PATH_INFO, like we do for a broken version of lighttpd with LighttpdFixScriptName