Why Do Closed WebSockets Trigger Heroku H15 Errors?

Troubleshooting Heroku H15 Error on Web Socket Closure

On Heroku, routers often exhibit the H15 error when web socket connections close. This occurs when the router interprets the time taken as excessive, triggering a 55-second timeout. However, in the case of web sockets, this error may be a false positive.

Underlying Mechanism

The underlying mechanism responsible for this error lies in the client-server interaction. Clients, following an initial HTTP connection, establish a WebSocket connection that remains open indefinitely due to periodic heartbeats. However, when the client disconnects, causing the connection to close, Heroku recognizes the termination but incorrectly identifies it as an idle request.

False Positive

Despite the H15 error in the logs, the WebSocket connection was functioning normally until the client initiated the closure. Therefore, these errors can be attributed to legitimate user departures.

Conclusion

The H15 error on Heroku for closed web socket connections is often a false positive. It arises because Heroku considers a closed connection as an idle request, resulting in a timeout violation. This misconception can lead to unnecessary concerns.

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