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Status: Reported (1)

RFC 7692, "Compression Extensions for WebSocket", December 2015

Source of RFC: hybi (art)

Errata ID: 4982

Status: Reported
Type: Technical

Reported By: Mark Straver
Date Reported: 2017-03-28

Section 7.1.1.1 says:

A server MAY include the "server_no_context_takeover" extension
parameter in an extension negotiation response even if the extension
negotiation offer being accepted by the extension negotiation
response didn't include the "server_no_context_takeover" extension
parameter.

It should say:

A server MAY include the "server_no_context_takeover" extension
parameter in an extension negotiation response even if the extension
negotiation offer being accepted by the extension negotiation
response didn't include the "server_no_context_takeover" extension
parameter.
A client SHOULD treat the "server_no_context_takeover" extension
parameter in an extension negotiation response as a hint with no
requirement to provide an implementation, and MUST NOT treat this
parameter, if included in the response, as an invalid configuration.

Notes:

It is currently possible for a client and a server to implement per spec and fail to make a connection.

There is no requirement for a client to implement this purely optional parameter, nor to understand this parameter if not implemented. If not supported, this would result in an invalid configuration. As a result, point 7 mandates that the socket connection MUST be closed.
This will only occur if a client has no implementation for this parameter and does not understand/accept the parameter, and the server sends an unsolicited "server_no_context_takeover" parameter in its response, which is allowed.

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