rfc9209v8.txt   rfc9209.txt 
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2.1.3. next-protocol 2.1.3. next-protocol
The next-protocol parameter's value indicates the Application-Layer The next-protocol parameter's value indicates the Application-Layer
Protocol Negotiation (ALPN) protocol identifier [RFC7301] of the Protocol Negotiation (ALPN) protocol identifier [RFC7301] of the
protocol used by the intermediary to connect to the next hop when protocol used by the intermediary to connect to the next hop when
obtaining this response. obtaining this response.
The value MUST be either a Token or Byte Sequence representing a TLS The value MUST be either a Token or Byte Sequence representing a TLS
ALPN Protocol ID (see <https://www.iana.org/assignments/tls- ALPN Protocol ID (see <https://www.iana.org/assignments/tls-
extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol- extensiontype-values#alpn-protocol-ids>). If the protocol identifier
ids>). If the protocol identifier is able to be expressed as a Token is able to be expressed as a Token using ASCII encoding, that form
using ASCII encoding, that form MUST be used. MUST be used.
For example: For example:
Proxy-Status: "proxy.example.org"; next-protocol=h2 Proxy-Status: "proxy.example.org"; next-protocol=h2
Note that the ALPN identifier is being used here to identify the Note that the ALPN identifier is being used here to identify the
protocol in use; it may or may not have been actually used in the protocol in use; it may or may not have been actually used in the
protocol negotiation. protocol negotiation.
2.1.4. received-status 2.1.4. received-status
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