fix proxy response bug, add log for response object

src/msg_handler/utils_response.rs

@@ -0,0 +1,33 @@
+use crate::{log::*, utils::*};
+use hyper::Response;
+use std::fmt::Display;
+
+////////////////////////////////////////////////////
+// Functions of utils for request messages
+pub trait ResLog {
+  fn log<T1: Display, T2: Display + ToCanonical>(
+    self,
+    server_name: &T1,
+    client_addr: &T2,
+    extra: Option<&str>,
+  );
+}
+impl<B> ResLog for &Response<B> {
+  fn log<T1: Display, T2: Display + ToCanonical>(
+    self,
+    server_name: &T1,
+    client_addr: &T2,
+    extra: Option<&str>,
+  ) {
+    let canonical_client_addr = client_addr.to_canonical();
+    info!(
+      "{} <- {} -- {} {:?} {:?} {}",
+      canonical_client_addr,
+      server_name,
+      self.status(),
+      self.version(),
+      self.headers(),
+      extra.map_or_else(|| "", |v| v)
+    );
+  }
+}