How does a user request work when opening a web page?

When a user opens a web page, a sequence of actions occurs:

1. The user enters a URL or clicks a link in the browser.
2. The browser converts the domain name into an IP address via a DNS query.
3. A TCP connection is established with the server using the obtained IP and port (usually 80 for HTTP or 443 for HTTPS).
4. If HTTPS is used, a TLS handshake occurs to establish a secure channel.
5. The browser sends an HTTP request (GET, POST, etc.) to the server.
6. The server processes the request, possibly accessing a database or other services.
7. The server forms an HTTP response with the page content (HTML, CSS, JS, images).
8. The browser receives the response, parses the HTML, and loads additional resources (CSS, JS, images) via separate requests.
9. The page is rendered for the user.

Thus, the user's request is a chain of network and software operations, starting from name resolution and ending with rendering the page in the browser.