update to 4.0

rule_sample/sample_use_local_response.js

@@ -0,0 +1,20 @@
+/* 
+  sample: 
+    intercept all requests toward httpbin.org, use a local response
+  test:
+    curl http://httpbin.org/user-agent --proxy http://127.0.0.1:8001
+*/
+module.exports = {
+  *beforeSendRequest(requestDetail) {
+    const localResponse = {
+      statusCode: 200,
+      header: { 'Content-Type': 'application/json' },
+      body: '{"hello": "this is local response"}'
+    };
+    if (requestDetail.url.indexOf('http://httpbin.org') === 0) {
+      return {
+        response: localResponse
+      };
+    }
+  },
+};