After the TCP connection is established, the browser can start fetching resources from the server.

1. HTTP Request

HTTP requests are used to fetch resources from the server. It requires a URL & the type of request (GET, POST, PUT, DELETE) to be processed. The browser also adds some additional headers to the request to provide additional context.

The first request sent to a server is usually a GET request to fetch an HTML file.

3. HTTP Response

The server then responds with an appropriate HTTP response for the given request.

The response contains the status code, the headers & the body.