YARP keep terminating the WebSocket after around 2 minutes

[AbdallahR99]

When I connect to the web socket through the original site, there is no problem in connecting and it lasts for a long time

But when I connect through YARP reverse proxy , this error appears after around 2 minutes:

UpgradeActivityTimeout: The WebSocket connection was closed after being idle longer than the Activity Timeout.

System.OperationCanceledException: The operation was canceled.

   at System.Threading.CancellationToken.ThrowOperationCanceledException()

   at System.IO.Pipelines.Pipe.GetReadAsyncResult()

   at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContext.ReadAsync(Memory`1 memory, CancellationToken cancellationToken)

   at Microsoft.AspNetCore.Server.IIS.Core.HttpRequestStream.ReadAsyncInternal(Memory`1 buffer, CancellationToken cancellationToken)

   at Yarp.ReverseProxy.Forwarder.StreamCopier.CopyAsync(Stream input, Stream output, Int64 promisedContentLength, StreamCopierTelemetry telemetry, ActivityCancellationTokenSource activityToken, Boolean autoFlush, CancellationToken cancellation)

I also noticed that yarp receive the ws calls as http

[MihaZupan]

YARP uses an ActivityTimeout with a 100-second default on all requests.
See https://microsoft.github.io/reverse-proxy/articles/http-client-config.html#httprequest

The way to avoid it triggering for long-lived requests like WebSockets is to enable keep-alive/ping mechanisms.

[AbdallahR99]

@MihaZupan modified the ActivityTimeout and still facing the same issue
tried also to override the keep-alive in the headers and nothing changed

[MihaZupan]

You're seeing messages about The WebSocket connection was closed after being idle longer than the Activity Timeout. after two minutes even after increasing the timeout?

Are you able to create a small runnable repro?

Keep-Alive headers won't affect this. What I was referring to are actual periodic pings sent by the WebSocket client and/or server. E.g. if the client is using ClientWebSocket, you can change the KeepAliveInterval.