opt: 变量大小写

curl.proto

@@ -16,8 +16,8 @@ service CurlWithResolve {
 message CurlRequest {
   string url = 1;
   string ip = 2;
-  string UA = 3;
-  bool UseHeadMethod = 4;
+  string ua = 3;
+  bool useHeadMethod = 4;
 }
 
 // response