Question
Explain the HTTP request-response cycle. Describe how request parameters, headers and cookies are exchanged between a client and a web server.
Answer :
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Skip in 10
The HTTP request-response cycle is the fundamental communication process that enables interaction between a web client, such as a browser, and a web server. HTTP (Hypertext Transfer Protocol) is a stateless application-layer protocol that allows clients to request resources and servers to deliver them. Every interaction on the web, including loading web pages, submitting forms, downloading files, or accessing APIs, follows this request-response mechanism. The cycle begins when a user enters a URL into a browser or clicks on a hyperlink. The browser first resolves the domain name into an IP address using the Domain Name System (DNS). It then establishes a connection with the web server, typically using TCP. If HTTPS is used, a TLS/SSL handshake is performed to establish a secure encrypted connection before HTTP communication begins. Once the connection is established, the browser sends an HTTP request to the server. An HTTP request consists of several components. The request line contains the HTTP method, such as GET, POST, PUT, DELETE, or PATCH, the requested resource path, and the HTTP version. Following the request line are request headers that provide additional information about the request. An optional message body is included in methods such as POST or PUT when data needs to be sent to the server. Request parameters are used to transmit input values from the client to the server. These parameters can be sent in different ways. Query parameters are appended to the URL after a question mark and are commonly used with GET requests. For example, `/search?keyword=books&page=2` sends the parameters
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