Internet Assigned Numbers Authority

Hypertext Transfer Protocol (HTTP) Upgrade Token Registry

Last Updated
2022-06-23
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Registry included below

HTTP Upgrade Tokens

Registration Procedure(s)
First Come First Served
Reference
[RFC9110, Section 16.7]
Note
Please see [RFC9110], Section 16.7 for details regarding token registrations.
    
Available Formats

CSV
Value Description Expected Version Tokens Reference
HTTP Hypertext Transfer Protocol any DIGIT.DIGIT (e.g., "2.0") [RFC9110, Section 2.5]
TLS Transport Layer Security ANY DIGIT.DIGIT (e.g., "1.2") [RFC2817]
WebSocket The Web Socket Protocol [RFC6455]
websocket The Web Socket Protocol [RFC6455][RFC8441]
h2c Hypertext Transfer Protocol version 2 (HTTP/2) (OBSOLETE) [RFC9113, Section 3.1]
connect-udp Proxying of UDP Payloads [RFC-ietf-masque-connect-udp-15]