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By default, WebSocket route is one-way, and it only sends a message to the client when API Gateway couldn't process the incoming message correctly.
In your case, API Gateway successfully executed the API, but your Lambda is returning 5xx. To send a result as a message to the client, you need to configure your route as "two-way" by configuring a route response.
https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-route-response.html
답변함 4년 전