Allow header on success

src/main.rs

@@ -106,6 +106,7 @@ fn main() -> Result<(), Error> {
 
     let mut client_body = beresp
         .clone_without_body()
+        .with_header(header::ALLOW, "GET, HEAD")
         .with_content_type(mime::TEXT_HTML_UTF_8)
         .stream_to_client();