Add 'close' and 'aborted' events to Agent responses

Closes GH-722.

lib/http.js

@@ -1235,10 +1235,15 @@ Agent.prototype._establishNewConnection = function() {
     // has a request but no response and it never emitted an error event:
     // THEN we need to trigger it manually.
     // There must be a better way to do this.
-    if (socket._httpMessage &&
-        !socket._httpMessage.res &&
-        !socket._httpMessage._hadError) {
-      socket._httpMessage.emit('error', new Error('socket hang up'));
+    if (socket._httpMessage) {
+      if (socket._httpMessage.res) {
+        socket._httpMessage.res.emit('aborted');
+        socket._httpMessage.res.emit('close');
+      } else {
+        if (!socket._httpMessage._hadError) {
+          socket._httpMessage.emit('error', new Error('socket hang up'));
+        }
+      }
     }
 
     self._removeSocket(socket);

test/simple/test-http-abort-client.js

@@ -0,0 +1,46 @@
+var common = require("../common");
+var http = require("http");
+var assert = require("assert");
+
+var server = http.Server(function (req, res) {
+  console.log("Server accepted request.");
+  res.writeHead(200);
+  res.write("Part of my res.");
+
+  res.destroy();
+});
+
+var responseClose = false
+
+server.listen(common.PORT, function() {
+  var client = http.get({
+    port: common.PORT,
+    headers: { connection: "keep-alive" }
+
+  }, function(res) {
+    server.close();
+
+    console.log("Got res: " + res.statusCode);
+    console.dir(res.headers);
+
+    res.on("data", function (chunk) {
+      console.log("Read " + chunk.length + " bytes");
+      console.log(chunk.toString());
+    });
+
+    res.on("end", function () {
+      console.log("Response ended.");
+    });
+
+    // it would be nice if this worked:
+    res.on("close", function () {
+      console.log("Response aborted");
+      responseClose = true;
+    });
+  });
+});
+
+
+process.on('exit', function() {
+  assert.ok(responseClose);
+});