From 733150194ba191ea3121d0fe5ab3157649d8df24 Mon Sep 17 00:00:00 2001
From: "Paul J. Dorn" <pajod@users.noreply.github.com>
Date: Thu, 20 Mar 2025 22:42:15 +0100
Subject: [PATCH] stop pretending to support gzip
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* https://peps.python.org/pep-3333/#other-http-features

"WSGI servers must handle any supported inbound “hop-by-hop”
headers on their own, such as by decoding any inbound
Transfer-Encoding, including chunked encoding if applicable."

* https://datatracker.ietf.org/doc/html/rfc9110#section-7.6.1

"intermediaries SHOULD remove or replace fields that are
known to require removal before forwarding"

* partial revert: 555d2fa27f2d891f23bd03890e4a826b5018c6b4
---
 gunicorn/http/message.py               | 5 -----
 tests/requests/invalid/chunked_06.http | 2 +-
 tests/requests/valid/025.http          | 2 +-
 tests/requests/valid/025.py            | 2 +-
 tests/requests/valid/025_line.http     | 2 +-
 tests/requests/valid/025_line.py       | 2 +-
 6 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/gunicorn/http/message.py b/gunicorn/http/message.py
index 59ce0bf4b..6c9c4b01c 100644
--- a/gunicorn/http/message.py
+++ b/gunicorn/http/message.py
@@ -190,11 +190,6 @@ def set_body_reader(self):
                         # safe option: nuke it, its never needed
                         if chunked:
                             raise InvalidHeader("TRANSFER-ENCODING", req=self)
-                    elif val.lower() in ('compress', 'deflate', 'gzip'):
-                        # chunked should be the last one
-                        if chunked:
-                            raise InvalidHeader("TRANSFER-ENCODING", req=self)
-                        self.force_close()
                     else:
                         raise UnsupportedTransferCoding(value)
 
diff --git a/tests/requests/invalid/chunked_06.http b/tests/requests/invalid/chunked_06.http
index ef70faab9..8d4aaa6e9 100644
--- a/tests/requests/invalid/chunked_06.http
+++ b/tests/requests/invalid/chunked_06.http
@@ -1,6 +1,6 @@
 POST /chunked_not_last HTTP/1.1\r\n
 Transfer-Encoding: chunked\r\n
-Transfer-Encoding: gzip\r\n
+Transfer-Encoding: identity\r\n
 \r\n
 5\r\n
 hello\r\n
diff --git a/tests/requests/valid/025.http b/tests/requests/valid/025.http
index e1cc2b580..fbd573a9d 100644
--- a/tests/requests/valid/025.http
+++ b/tests/requests/valid/025.http
@@ -1,5 +1,5 @@
 POST /chunked HTTP/1.1\r\n
-Transfer-Encoding: gzip\r\n
+Transfer-Encoding: identity\r\n
 Transfer-Encoding: chunked\r\n
 \r\n
 5\r\n
diff --git a/tests/requests/valid/025.py b/tests/requests/valid/025.py
index d23870680..eb97b6301 100644
--- a/tests/requests/valid/025.py
+++ b/tests/requests/valid/025.py
@@ -3,7 +3,7 @@
     "uri": uri("/chunked"),
     "version": (1, 1),
     "headers": [
-        ('TRANSFER-ENCODING', 'gzip'),
+        ('TRANSFER-ENCODING', 'identity'),
         ('TRANSFER-ENCODING', 'chunked')
     ],
     "body": b"hello world"
diff --git a/tests/requests/valid/025_line.http b/tests/requests/valid/025_line.http
index bde502671..b91863e3d 100644
--- a/tests/requests/valid/025_line.http
+++ b/tests/requests/valid/025_line.http
@@ -1,5 +1,5 @@
 POST /chunked HTTP/1.1\r\n
-Transfer-Encoding: gzip,chunked\r\n
+Transfer-Encoding: identity,chunked\r\n
 \r\n
 5\r\n
 hello\r\n
diff --git a/tests/requests/valid/025_line.py b/tests/requests/valid/025_line.py
index b2ebc652e..e7e9ad92c 100644
--- a/tests/requests/valid/025_line.py
+++ b/tests/requests/valid/025_line.py
@@ -3,7 +3,7 @@
     "uri": uri("/chunked"),
     "version": (1, 1),
     "headers": [
-        ('TRANSFER-ENCODING', 'gzip,chunked')
+        ('TRANSFER-ENCODING', 'identity,chunked')
 
     ],
     "body": b"hello world"