Multiple error event calls in Node.js domain

The following code runs a domain and creates a http request. The request tries to connect to an unknown host, which emits the error event of the request. The request error handler passes the error to the domain error handler by throwing it.

In my understanding the request error event should be emitted one time with ECONNREFUSED, but instead it's emitted two times: first with ECONNREFUSED and then with ECONNRESET.

However, when I don't use a domain the code works as expected (only one error). Same when I use a domain, but don't throw the error. It also works when I use a normal EventEmitter object instead of a http request.

Can anyone explain this behaviour to me and tell me how to get the error handling fixed inside the domain?

// The problem only occurs inside a domain
var dom = require("domain").create();
dom.addListener("error", onDomError);
dom.run(run);

// // If we don't use a domain everything works
// run();

function run() {
    console.log("run");

    // The following code should throw _one_ error, but throws two instead
    var req = require("http").request({
        'hostname': "localhost",
        'port': 1337,
        'method': "GET",
        'path': "/error"
    });
    req.addListener('error', onError);

    // // This code works as excpected
    // var EventEmitter = require('events').EventEmitter;
    // var emitter = new EventEmitter();
    // emitter.addListener("error", onError);
    // emitter.emit("error", "some error");

    // Throwing the error seems to cause the error
    function onError(error) {
        console.log("onError");
        throw error;
    }

    // If we don't throw the error everthing works
    // function onError(error) {
    //  console.log("onError");
    //  console.log(error)
    // }
}

function onDomError(error) {
    console.log("onDomError");
    console.log(error);
}