Taming the Beast: Understanding and Harnessing the Power of HTTP Proxies
summary
Shows concrete fixes using Varnish: on‑the‑fly compression to halve cached size for text, a VCL ACL bug where reverse proxies accidentally authorize purge requests, and a real F5 case where headers over ~4,960 bytes (≈4KB) cause dropped backend connections. Demonstrates tooling: varnish gather for automated support dumps, varnishlog → JSON/NCSA for different consumers, curl -v/--resolve for repro, and basic tracing via W3C trace context and OpenTelemetry (Grafana/Tempo) to stitch client→backend transactions.
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chapters (7)
- 0:00Introduction
- 3:22HTTP reverse proxy
- 9:04HTTP proxy problems
- 18:04Debugging proxy issues
- 28:06Tracing HTTP proxies
- 32:46Varnish tracing with OpenTelemetry
- 33:10Q&A
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