always emit end in 0.4

lib/node-http-proxy/http-proxy.js

@@ -266,7 +266,12 @@ HttpProxy.prototype.proxyRequest = function (req, res, buffer) {
     // already been called and the 'error' event listener
     // removed.
     //
+    var ended = false
+    response.on('close', function () {
+      if(!ended) response.emit('end')
+    })
     response.on('end', function () {
+      ended = true
       if (!errState) {
         reverseProxy.removeListener('error', proxyError);