The library
Understand one thing.
Connect it to the next.
Start with an address, follow a response, or look inside a DNS cache. Every explanation includes a small example and primary references.
- concept
URL structure
Read a web address, one part at a time. Learn what reaches the server—and why the fragment is different.
Explore the idea - comparison
Latency vs bandwidth
Waiting is not the same as transferring. See how round-trip time, body size and goodput shape one simplified response.
Explore the idea - concept
DNS TTL
A DNS answer can outlive a change at its source. Follow one resolver cache—not a global propagation clock.
Explore the idea