ays all images and audio files in internet.html. The HTTP request contains simply an ASCII string GET/pub- lic/courses/internet. html HTTP/1.0 where the first word defines the method (command) to be executed. The second section defines the path and the file, which is followed by HTTP version. The following methods are used in requests: GET: Indicates that the client wants to fetch the specific resource, in the example in Figure 6.56, the internet. html file. That is, GET indi- cates that the user wants to read the Web page defined by the file internet.html. Introduction to Telecommunications Network Engineering HEAD: Request to read a Web page's header. POST: Adds information to an identified resource, for example, a Web page. PUT: Request to store a Web page. DELETE: Removes a Web page. LINK: Connects two existing resources. UNLINK: Breaks an existing connection between two resources. The GET method or command, which we use most often, requests server to send the page. In response the server describes MIME content type for decoding. If the GET is followed by If-Modified-Since, the server sends data only if they have been modified after the date given in the request. The browser caches a set of pages in history and if the page is already stored, and not updated after that, there is no need to transfer it again. This is why click- ing on the Back button on a browser often gives a very quick response. The HEAD method asks for the page header only. It can be used to check when a page was last modified or to collect information for indexing purposes. The POST command is used to add information to a bulletin board system or to send information filled in a Web form. The following methods allow a Web page manager to update informa- tion at the remote server. These requests usually contain content type and authentication information to prove that the user has permission to perform the requested action. The PUT method is the opposite of GET and it offers the ability to update Web pages on a remote server. The DELETE metho