AppSync Subscription error: 'SubProtocolNotSupportedError' about graphql-client HOT 6 CLOSED

Your server says Sub protocol not supported! You should check which websocket transport protocol you server supports and configure your client accordingly.

from graphql-client.

The AppSync developer guide specify that the protocol is "graphql-ws", which is the default for GraphQLHttpClientOptions.WebSocketProtocol

With these requirements, a WebSocket client can connect to the URL, which contains the real-time endpoint with the query string, using graphql-ws as the WebSocket protocol.

I have no idea what the sub protocol is. Is it different?

from graphql-client.

The client tries to auto-negotiate, which AppSync does not seem to support...

You can specify the used protocol by setting GraphQLHttpClientOptions.WebSocketProtocol to WebSocketProtocols.GRAPHQL_WS

from graphql-client.

I've added the line
options.WebSocketProtocol = WebSocketProtocols.GRAPHQL_WS;
and now GraphQLHttpClient.InitializeWebsocketConnection() is successfull which is great.

UnfortunateIy I am now getting a new error "You are not authorized to make this call" when I call Subscribe(...)

from graphql-client.

Well... seems you're not authorized 😉

I'm not that familiar with the AppSync API, but I'm sure there is documentation about how to authorize against it.

from graphql-client.

@rose-a Success !!

I found this other AppSync entry and it helped solving the issue.

Thanks a lot for your help!

from graphql-client.