The hypertext transfer protocol (HTTP) was developed by Tim Berners-Lee in 1991
• HTTP was designed to transfer pages between machines
• The client (or Web browser) makes a request for a given page and the Server is responsible for finding it and returning it to the client
• The browser connects and requests a page from the server
• The server reads the page from the file system, sends it to the client and terminates the connection.
Electronic Mail Protocols:
• Electronic mail uses the client/server model
• The organisation has an email server devoted to handling email
o Stores and forwards email messages
• Individuals use email client software to read and send email
o (e.g. Microsoft Outlook, or Netscape Messenger)
• Simple Mail Transfer Protocol (SMTP)
o Specifies format of mail messages
• Post Office Protocol (POP) tells the email server to:
o Send mail to the user’s computer and delete it from the server
o Send mail to the user’s computer and do not delete it from the server
o Ask whether new mail has arrived.
