Error codes returned when an Upgrade request is denied is not reported back to caller

[sanjeevp]

When a websocket connection is being created and an HTTP Upgrade request is sent, if the server returns an HTTP response back with an error code (such as 403 Forbidden, 503 Service Unavailable), this error code is not propagated back to the caller in the OnError event. The caller has no way to figure out why the connection attempt failed.

[sta]

Hello there,

websocket-sharp doesn't output those response status codes with OnError, it's because to follow 5 Feedback from the protocol of The WebSocket API, such as below:

User agents must not convey any failure information to scripts in a way that would allow a script to distinguish the following situations:
...

But you can see the response status code and headers with debug logs if you want.