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Application-Layer Protocol Negotiation (ALPN, RFC7301) is a TLS extension which allows a client to present a preference for which protocols it wishes to connect to, when a single port supports multiple multiple application protocols. It allows a transparent proxy to take a decision based on the beginning of an SSL/TLS stream without deciphering it. The new fetch "req.ssl_alpn" extracts the ALPN protocol names that may be present in the ClientHello message.