Showing content from http://www.iana.org/assignments/http-upgrade-tokens below:
Hypertext Transfer Protocol (HTTP) Upgrade Token Registry
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 [RFC9298] connect-ip Proxying of IP Payloads [RFC9484]
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