Disable brotli import in urllib3

news/10950.bugfix.rst

@@ -0,0 +1 @@
+Disable brotli import in vendored urllib3.

tools/vendoring/patches/urllib3.patch

@@ -27,3 +27,37 @@ index c43146279..4cded53f6 100644
 +        pyopenssl.inject_into_urllib3()
      except ImportError:
          pass
+
+diff --git a/src/pip/_vendor/urllib3/response.py b/src/pip/_vendor/urllib3/response.py
+index 38693f4fc..776e49dd2 100644
+--- a/src/pip/_vendor/urllib3/response.py
++++ b/src/pip/_vendor/urllib3/response.py
+@@ -7,10 +7,7 @@ from contextlib import contextmanager
+ from socket import error as SocketError
+ from socket import timeout as SocketTimeout
+ 
+-try:
+-    import brotli
+-except ImportError:
+-    brotli = None
++brotli = None
+ 
+ from ._collections import HTTPHeaderDict
+ from .connection import BaseSSLError, HTTPException
+diff --git a/src/pip/_vendor/urllib3/util/request.py b/src/pip/_vendor/urllib3/util/request.py
+index 25103383e..330766ef4 100644
+--- a/src/pip/_vendor/urllib3/util/request.py
++++ b/src/pip/_vendor/urllib3/util/request.py
+@@ -13,12 +13,6 @@ SKIP_HEADER = "@@@SKIP_HEADER@@@"
+ SKIPPABLE_HEADERS = frozenset(["accept-encoding", "host", "user-agent"])
+ 
+ ACCEPT_ENCODING = "gzip,deflate"
+-try:
+-    import brotli as _unused_module_brotli  # noqa: F401
+-except ImportError:
+-    pass
+-else:
+-    ACCEPT_ENCODING += ",br"
+ 
+ _FAILEDTELL = object()
+