Reproduce HTTP/3 QUIC stalls deterministically with Playwright using --origin-to-force-quic-on Chrome flag
Use Playwright with Chromium flags --enable-quic and --origin-to-force-quic-on to deterministically reproduce HTTP/3 QUIC stalls that only appear in real browsers with cached alt-svc headers. Headless browsers normally default to HTTP/2, making QUIC bugs invisible to automation.
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