Add test cases for the proxy, and do some tiny fixes.

the fixes are:
1. add "content-type" in headers for when dealing with localresponse
2. make a more accurate tip for throttle rate when lower than 1
3. make the crtMgr funcionality a more independent one
4. uppercase the request header before sending it out

update the tip

test/rule_shouldUseLocalResponse_spec.js

@@ -0,0 +1,57 @@
+/*
+* test for rule shouldUseLocal
+*
+*/
+
+const ProxyServerUtil = require('./util/ProxyServerUtil.js');
+const { proxyGet, generateUrl } = require('./util/HttpUtil.js');
+const Server = require('./server/server.js');
+const { printLog } = require('./util/CommonUtil.js');
+
+const rule = require('./test_rules/shouldUseLocalResponseRule.js');
+const expectedLocalBody = 'handled_in_local_response';
+
+
+testWrapper('http');
+testWrapper('https');
+
+function testWrapper(protocol, ) {
+    describe('Rule shouldUseLocalResponse should be working in :' + protocol, () => {
+        let proxyServer ;
+        let serverInstance ;
+
+        beforeAll((done) => {
+            jasmine.DEFAULT_TIMEOUT_INTERVAL = 2000000;
+            printLog('Start server for rule_shouldUseLocalResponse_spec');
+
+            serverInstance = new Server();
+
+            proxyServer = ProxyServerUtil.proxyServerWithRule(rule);
+
+            setTimeout(function() {
+                done();
+            }, 2000);
+        });
+
+        afterAll(() => {
+            serverInstance && serverInstance.close();
+            proxyServer && proxyServer.close();
+            printLog('Close server for rule_shouldUseLocalResponse_spec');
+
+        });
+
+        it('Should use local response if the assertion is true', done => {
+            const url = generateUrl(protocol, '/test/uselocal');
+            proxyGet(url, {})
+                .then(res => {
+                    expect(res.body).toEqual(expectedLocalBody);
+                    expect(res.headers['via-proxy-local']).toEqual('true');
+                    done();
+                }, error => {
+                    console.log('error happened in proxy get for shouldUseLocal: ',error);
+                    done.fail('error happened when test shouldUseLocal rule');
+                });
+
+        });
+    });
+}