Lab 4 - T.Shekhmametyev

[Littlepr1nce]

Goal

Trace a QuickNotes request end-to-end, debug a broken deployment using an outside-in approach, and analyze a TLS handshake.

Changes

• submissions/lab4.md: Task 1, Task 2 and Bonus task documentation.
• submissions/lab4-trace.txt: decoded HTTP packet capture.
• submissions/lab4-trace.pcap: HTTP packet capture.
• submissions/lab4-tls.pcap: TLS handshake capture.
• Wireshark screenshots for ClientHello, Supported Versions, and ServerHello.

Testing

• Task 1: captured and decoded a POST /notes request, verified debugging commands, and documented a 502 debugging approach.
• Task 2: reproduced bind: address already in use, walked the outside-in chain (ps → ss → curl → firewall → dig), and restored the service.
• Bonus: configured Caddy as a TLS reverse proxy and analyzed the TLS handshake.

Checklist

• Title is a clear sentence (≤ 70 chars)
• Commits are signed (git log --show-signature)
• submissions/lab4.md updated