update to 4.0

rule_sample/sample_modify_response_statuscode.js

@@ -0,0 +1,19 @@
+/* 
+  sample: 
+    modify all status code of http://httpbin.org/ to 404
+  test:
+    curl -I 'http://httpbin.org/user-agent' --proxy http://127.0.0.1:8001
+  expected response:
+    HTTP/1.1 404 Not Found
+*/
+module.exports = {
+  *beforeSendResponse(requestDetail, responseDetail) {
+    if (requestDetail.url.indexOf('http://httpbin.org') === 0) {
+      const newResponse = responseDetail.response;
+      newResponse.statusCode = 404;
+      return {
+        response: newResponse
+      };
+    }
+  }
+};