node.js http server, detect when clients disconnect

Question

I am using express with node.js for a http server. I store the response object so I can stream events down to the client on that channel. Is there a way to detect when the client disconnects? When I kill my client I can still write to the response object without getting any kind of exception/error. It looks like the service keeps the underlying tcp channel open as long as I keep writing to the response object.

Have you considered using socket.io

Alfred
– Alfred

2011-07-04 15:27:21 +00:00
Commented Jul 4, 2011 at 15:27 — Alfred
– Alfred, Commented Jul 4, 2011 at 15:27
res.connection.destroyed

Time Killer
– Time Killer

2020-01-12 12:42:09 +00:00
Commented Jan 12, 2020 at 12:42 — Time Killer
– Time Killer, Commented Jan 12, 2020 at 12:42

unsynchronized · Accepted Answer · 2019-04-20 14:25:16Z

55

req.on("close", function() {
  // request closed unexpectedly
});

req.on("end", function() {
  // request ended normally
});

edited Apr 20, 2019 at 14:25

unsynchronized

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answered Jul 4, 2011 at 14:28

Raynos

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6 Comments

Alfred Over a year ago

nice this is new for me also :)

Somebody Over a year ago

Note: 'close' can fire after 'end', but not vice versa. I'm confused. How can close be emitter after end? I can only imagine it vice versa. User dropped connection, but for example request to mysql already sent.

Phaneendra Charyulu Kanduri Over a year ago

both not happening when we switch off wifi. client showing disconnected, but server still connected giving unavailable-id in peerjs server

Sai Over a year ago

@PhaneendraCharyuluKanduri i'm in the same boat now, close triggers if the browser or the tab is closed but if there is an unexpected interruption then it is not triggered. wondering is there any handler that we can leverage.

Naveen Over a year ago

On node 12 close event is fired in the end anyways

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