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Using HTTP for Client-to-server Communication

• In the early days, HTTP was entered directly by the user at the console.
• To try the following using telnet, first enable telnet (Windows 7 or 8):
  
  1. Select Start >> Control Panel >> Programs >> Programs and Features >> Turn Windows features on and off.
  2. Check Telnet Client.
  3. Click OK.
• On PCs with older operating systems, telnet is enabled by default.
• Now try typing the following line in a command window:
  telnet condor.depaul.edu 80
  (The port number is 80 for telnet.)
  Then type the following HTTP command (not echoed so type carefully):
  GET /sjost/ HTTP
   
  followed by a blank line.
   
• If everything works properly, HTTP then displays the following header followed by the HTML code for the requested page:
  HTTP/1.1 302 Found
  Date: Thu, 27 Apr 2011 02:50:55 GMT
  Server: Apache/2.0.53 HP-UX-Apache-based_Web_Server (Unix) PHP/4.3.8
  Last-Modified: Sun, 02 Apr 2011 20:09:32 GMT
  ETag: "16896-61d-408dd700"
  Accept-Ranges:Bytes
  Content-Length: 1565
  Connection: close
  Content-Type: text/html
  HTML code follows ...