From be364b603021705f47cb3e69e33ccbaa617c4b31 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 1 Aug 2021 10:25:29 +0530
Subject: [PATCH] cleanup adding of gzip to accept-encoding

---
 mechanize/_gzip.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mechanize/_gzip.py b/mechanize/_gzip.py
index e09c67b..7a7b347 100644
--- a/mechanize/_gzip.py
+++ b/mechanize/_gzip.py
@@ -185,10 +185,10 @@ def __copy__(self):
     def http_request(self, request):
         if self.request_gzip:
             existing = [
-                x.strip()
+                x.strip().lower()
                 for x in request.get_header('Accept-Encoding', '').split(',')
             ]
-            if sum('gzip' in x for x in existing) < 1:
+            if 'gzip' not in existing:
                 existing.append('gzip')
                 request.add_header("Accept-Encoding",
                                    ', '.join(filter(None, existing)))