Lambda + API Gateway + WebSocket

Creating a Chat App with Serverless, WebSockets, and Python: A Tutorial

** modify iamRoleStatements if any error occurs:

  iamRoleStatements:
    - Effect: Allow
      Action:
        - "execute-api:ManageConnections"
        - "execute-api:Invoke"

Adding Websockets to your AWS Serverless application
The quickest way to add Websockets to your AWS Serverless application

Example websocket_send_message in aws lambda

WebSocket API: What does it mean that $disconnect is a best-effort event? How can I count active connections?

API Gateway 이용해서Websocket 애플리케이션 구성 (2부)