From 502aa875b78bccd7d743dbd783447050c3450139 Mon Sep 17 00:00:00 2001
From: Minh Vu <vuhoangminh97@gmail.com>
Date: Thu, 23 Jul 2026 23:08:47 +0200
Subject: [PATCH] fix(axum-core): skip non-data frames in BytesMut (#3811)

---
 axum-core/CHANGELOG.md                 | 3 +++
 axum-core/src/extract/request_parts.rs | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/axum-core/CHANGELOG.md b/axum-core/CHANGELOG.md
index e5cbe6c2..a0337250 100644
--- a/axum-core/CHANGELOG.md
+++ b/axum-core/CHANGELOG.md
@@ -14,9 +14,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **changed:** `impl IntoResponse for ()` (which gets called by
   `impl IntoResponse for HeaderMap`, `impl IntoResponse for Extensions` and
   others) now returns a body of unknown size.
+- **fixed:** Make the `BytesMut` extractor ignore non-data frames from custom
+  request bodies, matching the `Bytes` extractor ([#3811])
 
 [#3721]: https://github.com/tokio-rs/axum/pull/3721
 [#3742]: https://github.com/tokio-rs/axum/pull/3742
+[#3811]: https://github.com/tokio-rs/axum/pull/3811
 
 # 0.5.6
 
diff --git a/axum-core/src/extract/request_parts.rs b/axum-core/src/extract/request_parts.rs
index 5f09dde2..48df1fa1 100644
--- a/axum-core/src/extract/request_parts.rs
+++ b/axum-core/src/extract/request_parts.rs
@@ -89,7 +89,8 @@ async fn body_to_bytes_mut(body: &mut Body, bytes: &mut BytesMut) -> Result<(),
         .map_err(FailedToBufferBody::from_err)?
     {
         let Ok(data) = frame.into_data() else {
-            return Ok(());
+            // Match `Bytes` by ignoring non-data frames until the body ends.
+            continue;
         };
         bytes.put(data);
     }