410 error when posting message by websocket in JAVA

Question

Since websocket is a new feature provided by api gateway, it is difficult for me to find documentation or examples about using it in JAVA. I can only refer to the nodejs example, looking for similar apis in aws sdk for java. Finally, I can make connection and the server(a lambda function) can also receive the message from client. But I encountered problems when I tried to post message to client from server.  
  
The code is like below:

```
EndpointConfiguration endpointConfiguration = new EndpointConfiguration(
                "myendpoint.execute-api.ap-southeast-1.amazonaws.com/develop/", "ap-southeast-1");
        AmazonApiGatewayManagementApi api = AmazonApiGatewayManagementApiClientBuilder.standard()
                .withEndpointConfiguration(endpointConfiguration).build();
        PostToConnectionRequest request = new PostToConnectionRequest();
        String connectionId = "myconnectionId";
        request.withConnectionId(connectionId);
        request.withData(ByteBuffer.wrap("tset".getBytes()));
        api.postToConnection(request);
```

And the error info:

```
Exception in thread "main" com.amazonaws.AmazonServiceException: Unable to unmarshall exception response with the unmarshallers provided (Service: AmazonApiGatewayManagementApi; Status Code: 410; Error Code: null; Request ID: 66ef081c-70c5-11e9-9319-c18364b84c32)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1712)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1367)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1113)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:770)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:744)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:726)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:686)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:668)
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:532)
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:512)
	at com.amazonaws.services.apigatewaymanagementapi.AmazonApiGatewayManagementApiClient.doInvoke(AmazonApiGatewayManagementApiClient.java:273)
	at com.amazonaws.services.apigatewaymanagementapi.AmazonApiGatewayManagementApiClient.invoke(AmazonApiGatewayManagementApiClient.java:240)
	at com.amazonaws.services.apigatewaymanagementapi.AmazonApiGatewayManagementApiClient.invoke(AmazonApiGatewayManagementApiClient.java:229)
	at com.amazonaws.services.apigatewaymanagementapi.AmazonApiGatewayManagementApiClient.executePostToConnection(AmazonApiGatewayManagementApiClient.java:195)
	at com.amazonaws.services.apigatewaymanagementapi.AmazonApiGatewayManagementApiClient.postToConnection(AmazonApiGatewayManagementApiClient.java:167)
	at com.worksap.company.hue.inquiry.api.handler.WebsocketTestHandler.main(WebsocketTestHandler.java:114)
```

The error points to "api.postToConnection(request);"  
Maybe my code has some problems, please help me or give me some sample documentation reference.

Answer

As long as you invoke postToConnection to other available connections, it should not be a problem. $connect/$disconnect only affect the specific connection. You may need to check you are passing correct connectionIds.

Answer

410 Gone means the connection is already gone (=the client is disconnected) or the connection is not established yet.  
  
Are you trying to call postToConnection in $connect route integration? In the case, the connection is being established (which means not established yet), so you can't use postToConnection.

Answer

Cool. Thank you. Your response made me dig a little deeper and it did end up being an issue on my end.

Answer

Sorry to revive an old thread, but what about when the $disconnect route is called. When a user disconnects, I'm iterating over my list of other connections and attempting to send a message to all other users that someone has disconnected, but I get the
 `SerializationError: 410 Gone`
 error for all connections, and I know the others haven't disconnected.

Answer

Thank you for your help. I guess the truth is that I call postToConnection in connect handler and in this handler the connection has not been established. Then I separated the postToConnection code into the default handler and called it manually that worked eventually.

410 error when posting message by websocket in JAVA

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