How to listen to NodeJS https socket close event

Question

I have the following code

var https = require("https");
var fs = require("fs");

var server = https.createServer({
    key: fs.readFileSync('key.pem'),
    cert: fs.readFileSync('cert.pem')
}, function (req, res) {
    res.writeHead(200);
    res.end(req.url);
});
server.listen(8765, "0.0.0.0", function() {
    console.log("listening");
});
server.on("connection", function(socket) {
    console.log("socket connected", socket.remotePort);
    socket.on("data", function() {
        console.log("socket data");
    });
    socket.on("close", function() {
        console.log("socket closed");
    });
    socket.setTimeout(3000);
    setInterval(function() {
        console.log("socket destroyed: ", socket.destroyed);
    }, 500);
});

When I make a request to the app, the "socket connected PORT" logs to console, but neither "socket data" nor "socket closed" ever logs. To make sure my event listeners aren't ignored, I set up a polling on socket.destroyed but it always logs false , no matter how much I wait.

I've made the request using chrome, safari, firefox, curl, but every one of my request gives the same result. I also did a Wireshark analysis and the client does indeed send a FIN packet and the server responds to it with its own FIN packet.

My question is, how can I get notified when the https socket closes? Is this socket some kind of proxy object made by the cypher to create clear text stream?

Update

The socket that NodeJS uses does close, as the server.connections changes as expected and if I call server.close(callback) , the callback does get executed and the process terminates gracefully.

Answer 1

From node documentation

socket.setTimeout(timeout[, callback])

"When an idle timeout is triggered the socket will receive a 'timeout' event but the connection will not be severed. The user must manually end() or destroy() the socket."

This probably means that it will not dispatch close event because the connection is not really terminated for it.

Try also to listen to end event instead of close .

Untested code

server.on("connection", function(socket) {
    socket.setEncoding('UTF-8');
    console.log("socket connected", socket.remotePort);
    socket.on("data", function() {
        console.log("socket data");
    });
    socket.on("end", function() {
        console.log("socket closed");
    });
    socket.setTimeout(3000, function(){
      socket.end();
    });
    setInterval(function() {
        console.log("socket destroyed: ", socket.destroyed);
    }, 500);
});