Application-Layer Protocol Negotiation (ALPN)
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curl --help --no-alpn Disable the ALPN TLS extension
ALPN: server did not agree on a protocol. Uses default.
openssl s_client -connect HTTP/2
ALPN protocol: h2
See also[edit]
openssl [ s_clients | -verify_return_error ]- TLS, TLS 1.3, mTLS: OpenSSL, LibreSSL, BoringSSL, WolfSSL, X.509,
.pem, SNI, CT, OCSP, Mbed TLS, ALPN,your connection is not private, SSL Certificate Checker, Wildcard certificate, JA3 fingerprint, sslcan, TLS inspection, Opportunistic TLS (StartTLS), tools
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