SocketException: Connection reset by peer (OS Error: Connection reset by peer)

[leeflix]

I am using websockets in my dart application. My server occasionally crashes when a "peer resets the connection". I think its odd that an exception crashes the program. Is there any way to handle this?

[mraleph]

You would need to post a reproduction etc. Without code we could debug this is unactionable.

[leeflix]

@mraleph I am not doing anything fancy basically everything i do boils down to this:

    // start listening for ws connections there is no problem here
    
    SecurityContext? securityContext;
    var server;
    if (Env.certificateChainPath != null && Env.privateKeyPath != null) {
      securityContext = SecurityContext()
        ..usePrivateKeyBytes(File(Env.privateKeyPath!).readAsBytesSync())
        ..useCertificateChainBytes(File(Env.certificateChainPath!).readAsBytesSync());
      server = await HttpServer.bindSecure(Env.local ? "localhost" : InternetAddress.anyIPv6, Env.wsPort, securityContext);
    } else {
      server = await HttpServer.bind(Env.local ? "localhost" : InternetAddress.anyIPv6, Env.wsPort);
    }

    // the problem should be after here

    await for (var request in server) {
        if (WebSocketTransformer.isUpgradeRequest(request)) {
          WebSocket ws = await WebSocketTransformer.upgrade(request);
          ws.add(...); // send data
        }
    }

[leeflix]

I don't know where the error exactly occurs: