update to 4.0

rule_sample/sample_modify_request_header.js

@@ -0,0 +1,17 @@
+/* 
+  sample: 
+    modify the user-agent in requests toward httpbin.org
+  test:
+    curl http://httpbin.org/user-agent --proxy http://127.0.0.1:8001
+*/
+module.exports = {
+  *beforeSendRequest(requestDetail) {
+    if (requestDetail.url.indexOf('http://httpbin.org') === 0) {
+      const newRequestOptions = requestDetail.requestOptions;
+      newRequestOptions.headers['User-Agent'] = 'AnyProxy/0.0.0';
+      return {
+        requestOptions: newRequestOptions
+      };
+    }
+  },
+};