Using Gamelift Realtime with webgl Unity builds

Question

I've got most of the process working but at the Client.connect()
I come across this error in the webgl client:

```
SocketException: Success
System.Net.Sockets.Socket..ctor (System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType) (at <00000000000000000000000000000000>:0)
--- End of stack trace from previous location where exception was thrown ---
```

this also occurs when trying to collect a local udp port (I simply set it to -1) which causes the error to occur later on at client.connect()

Thank you for any help!

Answer

Hi! It is not clear to me exactly from the error you've shared what is causing this issue, however, I hope that I can nevertheless assist.

You mentioned UDP in your post. Unfortunately, web browsers do not natively support communication over raw TCP sockets or UDP. They support WebRTC DataChannels for unreliable unordered messaging and WebSockets for reliable ordered messaging, but these are specific protocols running on top of TCP and UDP.  I suspect that what's happening here is that the GameLift Realtime Client SDK / Unity tries to prepare for receiving packets on TCP or UDP, but this is not supported for WebGL builds and that's why it's throwing the error. [As per Unity's own documentation about networking in WebGL](https://docs.unity3d.com/Manual/webgl-networking.html):
> Note that you can’t use .NET networking classes, because JavaScript code doesn’t have direct access to IP Sockets to implement network connectivity.

My current understanding is that because of this browser limitation, WebGL builds are not supported in GameLift Realtime either. However, there is one thing you can try; you can try passing a custom [ClientConfiguration](https://docs.aws.amazon.com/gamelift/latest/developerguide/realtime-sdk-csharp-ref-datatypes.html#realtime-sdk-csharp-ref-datatypes-clientconfiguration) to the [GameLift Realtime Server Client constructor](https://docs.aws.amazon.com/gamelift/latest/developerguide/realtime-sdk-csharp-ref-actions.html#realtime-sdk-csharp-ref-actions-client). Try changing the [connectionType](https://docs.aws.amazon.com/gamelift/latest/developerguide/realtime-sdk-csharp-ref-datatypes.html#realtime-sdk-csharp-ref-datatypes-enums) to something else. If you're using `RT_OVER_WS_UDP_UNSECURED`, try using `RT_OVER_WSS_DTLS_TLS12` or `RT_OVER_WEBSOCKET`.

Using Gamelift Realtime with webgl Unity builds

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