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Ignore a subprotocol the WebSocket client did not offer

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A SubProtocolSelector could return a value outside the client's
Sec-WebSocket-Protocol list, and the server sent it back as is. The
server now treats such a value as no selection.
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yhirose
2026-10-04 18:34:21 -04:00
parent 4fcbc08f2d
commit 6d1049462d
3 changed files with 31 additions and 1 deletions
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README-websocket.md
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@@ -119,7 +119,7 @@ using SubProtocolSelector =
std::function<std::string(const std::vector<std::string> &protocols)>;
```
The `SubProtocolSelector` receives the list of subprotocols proposed by the client (from the `Sec-WebSocket-Protocol` header) and returns the selected one. Return an empty string to decline all proposed subprotocols.
The `SubProtocolSelector` receives the list of subprotocols proposed by the client (from the `Sec-WebSocket-Protocol` header) and returns the selected one. Return an empty string to decline all proposed subprotocols. A returned value that the client did not propose is ignored.
### WebSocket (Server-side)