Many servers won't like getting a request that includes the 'http://hostname' part of the URL. Typically only proxy servers actually accept that. You might have better luck if you change: 
m{^http://(.*?)/}

#to

m{^http://(.*?)(/.*)$}

[download]
...and then set $url = $2 so you only request the URI (/authenticate.cgi). Before anyone else lays into me, this is a very rough solution and doesn't necessarily take everything into account. This is really what LWP is designed for, as it will use RFC-compliant methods to parse the URL instead of this quick and dirty stuff.

Update: It may be a virtual server, in which case you also need to send the Host: header in your request, like this: 
print $remote "GET $url HTTP/1.0\nHost: $host" . $BLANK;

[download]
I strongly suggest splitting the URI, too.

--isotope
http://www.skylab.org/~isotope/

In reply to Re: HTTP GET without LWP by isotope
in thread HTTP GET without LWP by bbfu

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