From d14e98b62b866e75c84baa19e36bf2d0bb7d49e7 Mon Sep 17 00:00:00 2001
From: Rob Ede <robjtede@icloud.com>
Date: Mon, 25 Dec 2023 02:27:51 +0000
Subject: [PATCH 1/2] prevent hang when compressing Sized(0) bodies

fixes #3229
---
 actix-http/CHANGES.md              |  4 ++++
 actix-http/src/encoding/encoder.rs | 17 ++++++++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/actix-http/CHANGES.md b/actix-http/CHANGES.md
index 3068b4ce2..053c4e512 100644
--- a/actix-http/CHANGES.md
+++ b/actix-http/CHANGES.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## Fixed
+
+- Prevent hang when returning zero-sized response bodies through compression layer.
+
 ## 3.5.0
 
 ### Changed
diff --git a/actix-http/src/encoding/encoder.rs b/actix-http/src/encoding/encoder.rs
index e084aa564..180927ac6 100644
--- a/actix-http/src/encoding/encoder.rs
+++ b/actix-http/src/encoding/encoder.rs
@@ -50,10 +50,21 @@ impl<B: MessageBody> Encoder<B> {
         }
     }
 
+    fn empty() -> Self {
+        Encoder {
+            body: EncoderBody::Full { body: Bytes::new() },
+            encoder: None,
+            fut: None,
+            eof: true,
+        }
+    }
+
     pub fn response(encoding: ContentEncoding, head: &mut ResponseHead, body: B) -> Self {
-        // no need to compress an empty body
-        if matches!(body.size(), BodySize::None | BodySize::Sized(0)) {
-            return Self::none();
+        // no need to compress empty bodies
+        match body.size() {
+            BodySize::None => return Self::none(),
+            BodySize::Sized(0) => return Self::empty(),
+            _ => {}
         }
 
         let should_encode = !(head.headers().contains_key(&CONTENT_ENCODING)

From f4f459d4209da58fe0c2794617c95b06fd9d0fc7 Mon Sep 17 00:00:00 2001
From: Rob Ede <robjtede@icloud.com>
Date: Mon, 25 Dec 2023 02:30:14 +0000
Subject: [PATCH 2/2] chore(actix-http): prepare release 3.5.1

---
 actix-http/CHANGES.md | 2 ++
 actix-http/Cargo.toml | 2 +-
 actix-http/README.md  | 4 ++--
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/actix-http/CHANGES.md b/actix-http/CHANGES.md
index 053c4e512..8a59f4337 100644
--- a/actix-http/CHANGES.md
+++ b/actix-http/CHANGES.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## 3.5.1
+
 ## Fixed
 
 - Prevent hang when returning zero-sized response bodies through compression layer.
diff --git a/actix-http/Cargo.toml b/actix-http/Cargo.toml
index 93a6bcbad..6c53f35cc 100644
--- a/actix-http/Cargo.toml
+++ b/actix-http/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "actix-http"
-version = "3.5.0"
+version = "3.5.1"
 authors = [
     "Nikolay Kim <fafhrd91@gmail.com>",
     "Rob Ede <robjtede@icloud.com>",
diff --git a/actix-http/README.md b/actix-http/README.md
index 790de65fd..9d80c10c4 100644
--- a/actix-http/README.md
+++ b/actix-http/README.md
@@ -5,11 +5,11 @@
 <!-- prettier-ignore-start -->
 
 [![crates.io](https://img.shields.io/crates/v/actix-http?label=latest)](https://crates.io/crates/actix-http)
-[![Documentation](https://docs.rs/actix-http/badge.svg?version=3.5.0)](https://docs.rs/actix-http/3.5.0)
+[![Documentation](https://docs.rs/actix-http/badge.svg?version=3.5.1)](https://docs.rs/actix-http/3.5.1)
 ![Version](https://img.shields.io/badge/rustc-1.68+-ab6000.svg)
 ![MIT or Apache 2.0 licensed](https://img.shields.io/crates/l/actix-http.svg)
 <br />
-[![dependency status](https://deps.rs/crate/actix-http/3.5.0/status.svg)](https://deps.rs/crate/actix-http/3.5.0)
+[![dependency status](https://deps.rs/crate/actix-http/3.5.1/status.svg)](https://deps.rs/crate/actix-http/3.5.1)
 [![Download](https://img.shields.io/crates/d/actix-http.svg)](https://crates.io/crates/actix-http)
 [![Chat on Discord](https://img.shields.io/discord/771444961383153695?label=chat&logo=discord)](https://discord.gg/NWpN5mmg3x)