update to 4.0

rule_sample/sample_modify_response_header.js

@@ -0,0 +1,19 @@
+/* 
+  sample: 
+    modify response header of http://httpbin.org/user-agent
+  test:
+    curl -I 'http://httpbin.org/user-agent' --proxy http://127.0.0.1:8001
+  expected response:
+    X-Proxy-By: AnyProxy
+*/
+module.exports = {
+  *beforeSendResponse(requestDetail, responseDetail) {
+    if (requestDetail.url.indexOf('http://httpbin.org/user-agent') === 0) {
+      const newResponse = responseDetail.response;
+      newResponse.header['X-Proxy-By'] = 'AnyProxy';
+      return {
+        response: newResponse
+      };
+    }
+  }
+};