fix the issue with TLS connection cache, when server doesn't recognize the cache, it will hang up the following request after the cached one.

refer to https://github.com/nodejs/node/issues/8368

lib/requestHandler.js

@@ -16,6 +16,9 @@ var http           = require("http"),
 
 var userRule = util.freshRequire('./rule_default');
 
+// to fix issue with TLS cache, refer to: https://github.com/nodejs/node/issues/8368
+https.globalAgent.maxCachedSessions = 0;
+
 function userRequestHandler(req,userRes){
     /*
     note