Browser & Web Performance · Junior · Question 1 of 75

You type a URL and press Enter. Which order of steps is closest to what the browser does first?

1HTTP request, DNS lookup, rendering, then the TCP connection
✓Correct answer: DNS lookup, TCP (and TLS) connection, HTTP request, then parsing the HTML response
3Parsing HTML, DNS lookup, HTTP request, then the TLS handshake

Explanation

The browser must resolve the host name to an IP, open a connection (plus TLS for HTTPS) and send the request before it gets any HTML to parse.

Further reading

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