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RFC 6455, "The WebSocket Protocol", December 2011

Note: This RFC has been updated by RFC 7936, RFC 8307, RFC 8441

Source of RFC: hybi (app)

Errata ID: 5453
Status: Rejected
Type: Technical
Publication Format(s) : TEXT
Reported By: Julian Reschke
Date Reported: 2018-08-08
Rejected by: Alexey Melnikov
Date Rejected: 2018-09-20

Section 4.1 says: 

   2.  If the response lacks an |Upgrade| header field or the |Upgrade|
       header field contains a value that is not an ASCII case-
       insensitive match for the value "websocket", the client MUST
       _Fail the WebSocket Connection_.

It should say:

   2.  If the response lacks an |Upgrade| header field or the |Upgrade|
       header field contains a value that does not match "WebSocket",
       the client MUST _Fail the WebSocket Connection_.

Notes:

HTTP upgrade tokens are case-sensitive, and the token registered by RFC 6455 is "WebSocket" (see <https://www.iana.org/assignments/http-upgrade-tokens/http-upgrade-tokens.xhtml>). Examples should be adjusted accordingly.

If stricter checks actually break the protocol, an alternative would be to register more variants of the token, such as "websocket".
--VERIFIER NOTES--
See <https://www.rfc-editor.org/errata/eid5498>. Implementations seem to be using "websocket", as shown in all examples in this RFC.

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