Knowing an HTTP request and response

An HTTP request is the message a client sends to the server in order to get some information or execute some action. It has two parts separated by a blank line: the header and body. The header contains all of the information related to the request itself, response expected, cookies, and other relevant control information, and the body contains the data exchanged. An HTTP response has the same structure, changing the content and use of the information contained within it.