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I am trying to create a chat app using Flask Websocket hosted on EC2 and expose using API Gateway. My App has both HTTP as well as SocketIO connection. My request flow is Browser -> API Gateway -> NLB -> EC2 . I created another API Gateway of type Websocket and but I am not able to connect to that API gateway. I tried testing with postman websocket request. I am able to connect to EC2 , I am able to connect to NLB (both on host 8765) but not able to conenct to AWS Gateway. I have followed all the posible permutations on API Gateway Websocket but not sucessfull. From post man I am getting HTTP 426 . Any pointers what should I do or document I can refer to. Below is my connection code from Front end

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