file:///some_file.html is a valid URI: 
use strict;
use WWW::Mechanize;

my $mech = WWW::Mechanize->new();
$mech->get('file:///test.html');
print $mech->content;

[download]

Update:

The file URI file:///some_file.html is a shortcut representation of file://localhost/some_file.html, and refers to the file some_file.html in the root directory.

The file URI for /home/espressoguy/mechtest/site_a.html would be file:///home/espressoguy/mechtest/site_a.html.

If you have spaces in the directory names, encode them as %20:
file:///Documents%20and%20Settings/EspressoGuy/My%20Documents/Mech%20Test/site_a.html

In reply to Re: WWW::Mechanize - offline debugging by keszler
in thread WWW::Mechanize - offline debugging by espressoguy

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