Debugging QUIC and HTTP/3 with qlog and qvis

Abstract

The QUIC and HTTP/3 protocols are powerful but complex and difficult to debug and analyse. Our previous work proposed the qlog format for structured endpoint logging to aid in taming this complexity. This follow-up study evaluates the real-world implementations, uses and deployments of qlog and our associated qvis tooling in academia and industry. Our survey among 28 QUIC experts shows high community involvement , while Facebook confirms qlog can handle Internet scale. Lessons learned from researching 16 QUIC+HTTP/3 and five TCP+TLS+HTTP/2 implementations demonstrate that qlog and qvis are essential tools for performing root-cause analysis when debugging modern Web protocols.