add connection=keep-alive

Author: felicienfrancois

lib/proxy.js

@@ -266,7 +266,8 @@ Proxy.prototype._onHttpServerConnect = function(req, socket, head) {
     socket.once('data', self._onHttpServerConnect.bind(self, req, socket));
     socket.write('HTTP/1.1 200 OK\r\n');
     if (self.keepAlive && req.headers['proxy-connection'] === 'keep-alive') {
-      socket.write('Proxy-Connection: Keep-Alive\r\n');
+      socket.write('Proxy-Connection: keep-alive\r\n');
+      socket.write('Connection: keep-alive\r\n');
     }
     return socket.write('\r\n');
   }
@@ -712,6 +713,7 @@ Proxy.prototype._onHttpServerRequest = function(isSSL, clientToProxyRequest, pro
       if (self.keepAlive) {
         if (ctx.clientToProxyRequest.headers['proxy-connection']) {
           ctx.serverToProxyResponse.headers['proxy-connection'] = 'keep-alive';
+          ctx.serverToProxyResponse.headers['connection'] = 'keep-alive';
         }
       } else {
         ctx.serverToProxyResponse.headers['connection'] = 'close';