move response data from memory to local cache file

test/large_post.js

@@ -0,0 +1,37 @@
+var proxy       = require("../proxy.js"),
+	proxyTester = require("proxy-eval"),
+	WebSocket   = require("ws"),
+    Buffer      = require("buffer").Buffer,
+    express     = require("express");
+
+var app = express()
+ 
+app.post('/', function (req, res) {
+    var bigBody = new Buffer(1024 * 1024 * 10);
+    res.send( bigBody ); //10 mb
+});
+app.listen(3000);
+
+function test(){
+    //test the basic availibility of proxy server
+    setTimeout(function(){
+        var testParam = {
+            proxy         : 'http://127.0.0.1:8001/',
+            reqTimeout    : 4500,
+            httpGetUrl    : "",
+            httpPostUrl   : "http://127.0.0.1:3000/",
+            httpPostBody  : "123",
+            httpsGetUrl   : "",
+            httpsPostUrl  : "",
+            httpsPostBody : ""
+        };
+    	proxyTester.test(testParam ,function(results){
+            process.exit();
+        });
+    },1000);
+};
+
+setTimeout(function(){
+    test();
+},3000);
+

test/test.js

@@ -44,7 +44,13 @@ exports.avalibility = function(test){
 
     //test the basic availibility of proxy server
     setTimeout(function(){
-    	proxyTester.test({proxy : 'http://127.0.0.1:8995',reqTimeout:4500} ,function(results){
+        var testParam = {
+            proxy         : 'http://127.0.0.1:8995',
+            reqTimeout    : 4500,
+            httpsPostUrl  : "http://www.sample.com/"
+            httpsPostBody : "123"
+        };
+    	proxyTester.test(testParam ,function(results){
     		var successCount = 0;
     		results.map(function(item){
     			item.success && ++successCount;