See what you get. To form the path to the file to be retrieved on a server, the client takes everything after the machine name and port number. On most servers, the HTTP protocol lives on port 80. To use other ports, we need to modify our URLs a bit, adding the port number after the machine name. The format of the request for HTTP is quite simple.
Additional headers can follow the request.
Fortunately, the web proxy can forward most of the requests verbatim to the appropriate server. Only a handful of headers require proxy intervention. Once the request line is received, the web proxy should continue reading the input from the client until it encounters a blank line. Using a Web Proxy To use a web proxy, you must configure your web browser. For Lynx, wget, or Mosaic, you must set an environment variable.