Revert "Add support for brotli decoding (psf#5783)"

This reverts commit 5351469.

HISTORY.md

@@ -5,8 +5,6 @@ dev
 ---
 
 -   \[Short description of non-trivial change.\]
-- Requests Brotli compression, if either the `brotli` or `brotlicffi` package
-  is installed.
 
 **Dependencies**
 

docs/community/faq.rst

@@ -11,9 +11,6 @@ Encoded Data?
 Requests automatically decompresses gzip-encoded responses, and does
 its best to decode response content to unicode when possible.
 
-When either the `brotli <https://pypi.org/project/Brotli/>`_ or `brotlicffi <https://pypi.org/project/brotlicffi/>`_
-package is installed, requests also decodes Brotli-encoded responses.
-
 You can get direct access to the raw response (and even the socket),
 if needed as well.
 

docs/user/quickstart.rst

@@ -128,9 +128,6 @@ You can also access the response body as bytes, for non-text requests::
 
 The ``gzip`` and ``deflate`` transfer-encodings are automatically decoded for you.
 
-The ``br``  transfer-encoding is automatically decoded for you if a Brotli library
-like `brotli <https://pypi.org/project/brotli>`_ or `brotlicffi <https://pypi.org/project/brotli>`_ is installed.
-
 For example, to create an image from binary data returned by a request, you can
 use the following code::
 

requests/utils.py

@@ -20,7 +20,6 @@
 import warnings
 import zipfile
 from collections import OrderedDict
-from urllib3.util import make_headers
 
 from .__version__ import __version__
 from . import certs
@@ -42,11 +41,6 @@
 
 DEFAULT_PORTS = {'http': 80, 'https': 443}
 
-# Ensure that ', ' is used to preserve previous delimiter behavior.
-DEFAULT_ACCEPT_ENCODING = ", ".join(
-    re.split(r",\s*", make_headers(accept_encoding=True)["accept-encoding"])
-)
-
 
 if sys.platform == 'win32':
     # provide a proxy_bypass version on Windows without DNS lookups
@@ -841,7 +835,7 @@ def default_headers():
     """
     return CaseInsensitiveDict({
         'User-Agent': default_user_agent(),
-        'Accept-Encoding': DEFAULT_ACCEPT_ENCODING,
+        'Accept-Encoding': ', '.join(('gzip', 'deflate')),
         'Accept': '*/*',
         'Connection': 'keep-alive',
     })