Problem
Http And Http2 is a critical layer of the network stack with direct implications for backend latency, throughput, and reliability.
Why It Matters (Latency, Throughput, Cost)
Deep understanding of network protocols enables engineers to diagnose latency issues, optimize connection management, and design resilient systems.
Mental Model
Network protocols operate as layered abstractions. Each layer provides guarantees and adds overhead.
Underlying Theory
Builds on OSI model (01) and TCP fundamentals (02).
Complexity Analysis
Network operations are dominated by propagation delay (O(distance/c)) and processing (O(packet_count)).
Key Takeaways
- Protocol understanding enables optimization beyond what framework defaults provide.
- Each additional round trip multiplies by RTT — minimize round trips in hot paths.
- Connection reuse, pipelining, and multiplexing all reduce RTT overhead.
Related Modules
./01-osi-and-tcp-ip.md./02-tcp-deep-dive.md../../07-core-backend-engineering/02-connection-pooling.md