End-to-end and Hop-by-hop Headers ---nginx-websocket
2024-10-18 22:37:03
https://www.oschina.net/translate/websocket-nginx
13.5.1 End-to-end and Hop-by-hop Headers
For the purpose of defining the behavior of caches and non-caching proxies, we divide HTTP headers into two categories:
- End-to-end headers, which must be transmitted to the ultimate recipient of a request or response. End-to-end headers in responses must be stored as part of a cache entry and transmitted in any response formed from a cache entry.
- Hop-by-hop headers, which are meaningful only for a single transport-level connection, and are not stored by caches or forwarded by proxies.
The following HTTP/1.1 headers are hop-by-hop headers:
- Connection
- Keep-Alive
- Public
- Proxy-Authenticate
- Transfer-Encoding
- Upgrade
All other headers defined by HTTP/1.1 are end-to-end headers.
Hop-by-hop headers introduced in future versions of HTTP MUST be listed in a Connection header, as described in section 14.10.
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