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Document that pre_request_handler runs for WebSocket routes

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yhirose
2026-09-19 15:11:34 -04:00
parent 4cb363e3f2
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README-websocket.md
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@@ -343,6 +343,18 @@ svr.WebSocket("/ws", [](const httplib::Request &req, httplib::ws::WebSocket &ws)
});
```
The check above runs after the handshake, so the client sees a successful upgrade followed by a close frame. To refuse the upgrade itself with an HTTP status, use a pre-routing or pre-request handler. Both run before the `101 Switching Protocols` response, and `req.matched_route` is available in the pre-request handler:
```cpp
svr.set_pre_request_handler([](const httplib::Request &req, httplib::Response &res) {
if (req.matched_route == "/ws" && req.get_header_value("Authorization").empty()) {
res.status = httplib::StatusCode::Unauthorized_401;
return httplib::Server::HandlerResponse::Handled; // not upgraded
}
return httplib::Server::HandlerResponse::Unhandled;
});
```
### Custom Headers and Timeouts
```cpp