topic Registered
Verified 2026-09-19 · registry updated 2023-10-20

HTTP registry: HTTP

Hypertext Transfer Protocol

Upgrade values negotiate an alternate protocol or capability at a defined HTTP boundary. HTTP is registered in HTTP Upgrade Tokens. Defining reference: RFC9110, Section 2.5.

httpregistryhttp-upgrade-tokenshttp-upgrade-tokens-1

Identifier (http)

HTTP

Hypertext Transfer Protocol

Validate the requested protocol and preserve authority and certificate checks.

This registry value is currently marked active by IANA. Follow the defining specification before sending, accepting, or proxying it.

IANA registry: http-upgrade-tokens/http-upgrade-tokens-1

Registry reference: RFC9110, Section 2.5

Sources

Permalink: https://merginit.com/reference/http/registry/http-upgrade-tokens/http-upgrade-tokens-1/http-194