ws-response: Invalid request.response given to API Gateway

[nbusser]

Description

At the end of ws-response middleware, we set request.response.statusCode to 200, so API Gateway knows that everything went well.

However, it actually wants an object containing ONLY statusCode. Otherwise, it will send an Internal Error message to the client.

Example:

In my lambda:

const handler = () => {
     return {
         Data: 'Hello',
    };
}

Here is the content of request.response at the end of the middleware:
{ ConnectionId: 'ZmDx-dJ4FiACFkQ=', Data: '"Hello"', statusCode: 200 }

I receive the following error message on the client:

Message from the server: "Hello"
Message from the server: {"message": "Internal server error", "connectionId":"ZmDx-dJ4FiACFkQ=", "requestId":"ZmDyDGyFliAFhVQ="}

Fix:

Replace line 42 by:

request.response = {
    statusCode: 200
}

By doing this, with the same lambda code, I receive the following message on the client:

Message from the server: "Hello"

Environment:

• Node.js: 20
• Middy: 4.x
• AWS SDK 3.x

[willfarrell]

Thanks for reporting. I should be able to get a fix out before the end of the weekend.