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curl --http2 reports version 0 when the backend (grpcbin) doesn't serve a proper HTTP response on GET /. Switch to openssl s_client -alpn h2 which tests TLS-level ALPN negotiation directly — the thing we actually care about. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
openssl s_client -alpn h2instead ofcurl --http2 -w '%{http_version}'0when grpcbin doesn't serve a proper HTTP response onGET /, causing the test to fail even though ALPN negotiation works correctlyTest plan
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