$ cat a.cgi
#!/usr/bin/env ruby
require 'cgi'
cgi = CGI.new
res = <<EOT
foo: #{cgi['foo']}
bar: #{cgi['bar']}
EOT
cgi.out("text/plain"){res}
$ w3m -dump 'http://www/a.cgi?foo=1&bar=2'
foo: 1
bar: 2
$ w3m 'http://www.ruby-lang.org/ja/man/index.cgi?cmd=view;name=CGI'
$ w3m 'http://raa.ruby-lang.org/cat.rhtml?category_major=Library;category_minor=CGI'