fix: response body timeout forwards the size hint

src/async_impl/body.rs

@@ -309,6 +309,16 @@ where
                 .map(|opt_chunk| opt_chunk.map_err(crate::error::body)),
         )
     }
+
+    #[inline]
+    fn size_hint(&self) -> http_body::SizeHint {
+        self.inner.size_hint()
+    }
+
+    #[inline]
+    fn is_end_stream(&self) -> bool {
+        self.inner.is_end_stream()
+    }
 }
 
 pub(crate) type ResponseBody =

tests/timeouts.rs

@@ -303,3 +303,23 @@ fn write_timeout_large_body() {
     assert!(err.is_timeout());
     assert_eq!(err.url().map(|u| u.as_str()), Some(url.as_str()));
 }
+
+#[tokio::test]
+async fn response_body_timeout_forwards_size_hint() {
+    let _ = env_logger::try_init();
+
+    let server = server::http(move |_req| async { http::Response::new(b"hello".to_vec().into()) });
+
+    let client = reqwest::Client::new();
+
+    let url = format!("http://{}/slow", server.addr());
+
+    let res = client
+        .get(&url)
+        .timeout(Duration::from_secs(1))
+        .send()
+        .await
+        .expect("response");
+
+    assert_eq!(res.content_length(), Some(5));
+}