LWP::Protocol::PSGI is a module to hijack *any* code that uses
LWP::UserAgent underneath such that any HTTP or HTTPS requests can
be routed to your own PSGI application.

Because it works with any code that uses LWP, you can override various
WWW::*, Net::* or WebService::* modules such as WWW::Mechanize,
without modifying the calling code or its internals.

use WWW::Mechanize;
use LWP::Protocol::PSGI;