Event on client disconnect/abort in a streaming response

[sommeeeer]

Im wondering if its possible to get any event emitted when a client aborts or disconnects during a streaming response with awslambda.streamifyResponse. I tried with this code, but from my testing it looks like theres no event emitted on the Lambda when that happens:

exports.handler = awslambda.streamifyResponse(
    async (event, responseStream, context) => {
        responseStream.setContentType('text/event-stream')
        responseStream.on("close", ()=> {
          // this never gets emitted at any point
          console.log("responseStream closed");
        });
        for (let i = 0; i < 20; i++) {
            await sleep(1000);
            responseStream.write(`event: ping\n`);
            responseStream.write(`data: ${i}\n\n`);
        }
        responseStream.end();
    }
);

This would be an awesome feature to add in the age of SSR streaming, and LLM's are being more and more used.