fix response body when no content-length header

actix-http/CHANGES.md

@@ -7,6 +7,10 @@
 - Add `body::to_body_limit()` function.
 - Add `body::BodyLimitExceeded` error type.
 
+### Fixed
+
+- Fix `MessageType::set_headers` not using the correct payload decoder when Transfer-Encoding and Content-Length are absent.
+
 ## 3.3.1 - 2023-03-02
 
 ### Fixed

actix-http/src/h1/decoder.rs

@@ -395,8 +395,20 @@ impl MessageType for ResponseHead {
             // switching protocol or connect
             PayloadType::Stream(PayloadDecoder::eof())
         } else {
-            // for HTTP/1.0 read to eof and close connection
-            if msg.version == Version::HTTP_10 {
+            let body_allowed = match msg.status.as_u16() {
+                100..=199 => false,
+                204 => false,
+                304 => false,
+                _ => true,
+            };
+            // for HTTP/1.0 and HTTP/1.1 read to eof and close connection
+            if msg.version == Version::HTTP_11 && body_allowed {
+                if let Some(ConnectionType::Close) = msg.conn_type() {
+                    PayloadType::Payload(PayloadDecoder::eof())
+                } else {
+                    PayloadType::None
+                }
+            } else if msg.version == Version::HTTP_10 {
                 msg.set_connection_type(ConnectionType::Close);
                 PayloadType::Payload(PayloadDecoder::eof())
             } else {

awc/tests/test_client.rs

@@ -769,7 +769,7 @@ async fn client_unread_response() {
 
     // awc does not read all bytes unless content-length is specified
     let bytes = res.body().await.unwrap();
-    assert_eq!(bytes, Bytes::from_static(b""));
+    assert_eq!(bytes, Bytes::from_static(b"welcome!"));
 }
 
 #[actix_rt::test]