This is a simple CGI script which submits an HTTP request to a web server and lets you see the entire response with HTTP headers and HTML and all. Quite useful for debugging or to see what kinds of servers are run at a specific site. You can also see the source code.
The simple version uses HTTP/1.0 and lets you examine any URL with either HTTP GET or HEAD. (GET gives you the headers and contents of the URL, HEAD only gives you the headers.) Remember to type a full URL starting with "http://". No other protocols are available.