What happens to the request after entering the domain in the browser and pressing Enter?

After entering a domain in the browser and pressing Enter, the following sequential process occurs:

1. Resolving the domain to an IP address: the browser contacts the DNS server to obtain the IP address corresponding to the entered domain.

2. Establishing a TCP connection: the browser establishes a TCP connection with the server using the obtained IP and port (usually 80 for HTTP or 443 for HTTPS).

3. TLS handshake (if HTTPS): if HTTPS is used, a secure connection is established via TLS.

4. Sending the HTTP request: the browser constructs and sends an HTTP request (e.g., GET) to the server.

5. Server processes the request: the server receives, processes the request, and formulates a response.

6. Receiving and processing the response: the browser receives the response (HTML, CSS, JS, images, etc.), parses it, and begins rendering the page.

7. Additional requests: the browser may send additional requests to load resources specified in the HTML (scripts, styles, images).

8. Page rendering: the browser constructs the DOM, CSSOM, executes JS, and displays the page to the user.

This process occurs very quickly and transparently to the user.