websockets / ws / 22551840520 / 27

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Pull #2314

github

[feature] Introduce the `requireProtocolSelection` option

To comply with the WHATWG specification, the connection must fail if the
server does not return the `Sec-WebSocket-Protocol` header when a client
requests specific subprotocols. However, some servers omit this header,
as such behavior is permitted by RFC 6455.

This new option adds the ability to skip that validation, enabling the
client to work with servers that are not WHATWG-compliant.

Refs: https://github.com/websockets/ws/issues/1862#issuecomment-3944705526

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