tests: enable http3 content-length test

Author: seanmonstar

tests/client.rs

@@ -87,14 +87,12 @@ async fn donot_set_content_length_0_if_have_no_body() {
 #[cfg(feature = "http3")]
 #[tokio::test]
 async fn http3_request_full() {
-    //use http_body_util::BodyExt;
+    use http_body_util::BodyExt;
 
     let server = server::http3(move |_req| async move {
-        /*
         assert_eq!(req.headers()[CONTENT_LENGTH], "5");
         let reqb = req.collect().await.unwrap().to_bytes();
         assert_eq!(reqb, "hello");
-        */
         http::Response::default()
     });