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my $url = 'http://www.myothersite.com/myotherwebapp2/foo.asp?param=1&p
+aram=3';

...
print "Using URI Escape:\n";
$esc_url = uri_escape($url);
print "$url\nbecomes\n$esc_url\n";

Using CGI Escape:
http://www.myothersite.com/myotherwebapp2/foo.asp?param=1&param=3
...
http://www.myothersite.com/myotherwebapp2/foo.asp?param=1&param=3
becomes
http%3A%2F%2Fwww.myothersite.com%2Fmyotherwebapp2%2Ffoo.asp%3Fparam%3D
+1%26param%3D3