t. The hosts are given alias names that usually begin with characters "www." Port: The Port number of the server is optional in the URL. If present, it is placed between the host and the path such that it is separated from the host with a semicolon. For example, request line "http://ww.crmapp:8050* has 8050 as the port number. Path: This is the path to the file where the information is located. The path has details of the directories including the subdirectories and files to access the file. Fundamentals of EMS, NMS and OSS/BSS The request type field present in the request message defines different messages (methods). Some of these methods are: GET: The GET method is the main method for retrieving a document from the server. When a GET request is issued by the client, the server responds with the document contents in the body of the response message. POST: Information can be provided by the client to the server using the POST method. HEAD: By using HEAD method it is possible to get information about a doc- ument. The server response to the HEAD method does not contain a body. LINK: Document can be linked to another location by specifying the file location in the URL part of the request line and the destination location in the entity header using the LINK method. UNLINK: Links created by the LINK method are deleted by the UNLINK method. PATCH: This method is a request for a new or replacement document. The PATCH method contains the list of differences that should be implemented in the existing file. MOVE: File location can be moved by specifying the source file location in the URL part of the request line and the destination location in the entity header using the MOVE method. OPTION: Information on the available options is requested by the client to the server using the OPTION method. DELETE: Document on the server can be deleted using the DELETE method. COPY: A file can be copied to another location by specifying the source file location in the URL part of the request line and the destination location in the ent