detecting request cancellation in WebApp.rawConnectHandlers

raw_connect_handler.js

/*
  I start this in one terminal and in another I do `curl 127.0.0.1:3000` and immediately ctrl-C.
  The output is:
  
$ meteor
[[[[[ ~/Desktop/raw_connect_handler_test ]]]]]

=> Started proxy.
=> Started MongoDB.     
=> Started your app.   

=> App running at: http://localhost:3000/
I20140909-21:25:26.887(-4)? handling a request
I20140909-21:25:26.930(-4)? local port: 24116
I20140909-21:27:26.832(-4)? CLOSE


 Note here the "CLOSE" gets printed two minutes after I hit ctrl-C! It
 seems that the 'close' event is not being emitted until the request times
 out -- any EOF event is getting ignored somehow.
 
 I expect instead for "CLOSE" to be printed as soon as I hit ctrl-C.
 
 I also expect the local port to be 3000. I guess this means that Meteor is putting my
 app behind some kind of proxy, and that proxy is failing to forward the 'close' event.

*/


if (Meteor.isServer) {
  Meteor.startup(function () {
      WebApp.rawConnectHandlers.use(function (req, res, next) {
          console.log("handling a request");
          console.log("local port: "  + req.connection.localPort);
          req.on('close', function() {
              console.log("CLOSE");
          });
      });

  });
}

server.js

/*
  This example works as I expect.

  I start this in one terminal and in another I do `curl 127.0.0.1:7000` and immediately ctrl-C.
  The output is:

$ node server.js
handling a request
local port: 7000
CLOSE

  where the "CLOSE" gets printed as soon as I hit ctrl-C.

*/


var connect = require("connect");
var http = require('http');

var app = connect();

app.use(function(req, res, next) {
    console.log("handling a request");
    console.log("local port: "  + req.connection.localPort);
    req.on("close", function() {
        console.log("CLOSE");
    });
});

var httpServer = http.createServer(app);

httpServer.listen(7000);

My question: how can I detect cancelled requests when using WebApp.rawConnectHandlers? It appears to me that the 'close' event does not get fired on EOF.

The root problem is a bug with older versions of http-proxy. Meteor uses version 1.0.2, but cancellation of requests is not handled until version 1.1.2:

http-party/node-http-proxy@77a1cff