Remove Accept-Encoding header from std_headers (#3153)

This should be set by each downloader to what it supports.
Fixes https://github.com/yt-dlp/yt-dlp/issues/3142
Authored-by: coletdjnz

yt_dlp/utils.py

@@ -159,7 +159,6 @@ if compat_brotli:
 std_headers = {
     'User-Agent': random_user_agent(),
     'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
-    'Accept-Encoding': ', '.join(SUPPORTED_ENCODINGS),
     'Accept-Language': 'en-us,en;q=0.5',
     'Sec-Fetch-Mode': 'navigate',
 }
@@ -1401,6 +1400,9 @@ class YoutubeDLHandler(compat_urllib_request.HTTPHandler):
             if h.capitalize() not in req.headers:
                 req.add_header(h, v)
 
+        if 'Accept-encoding' not in req.headers:
+            req.add_header('Accept-encoding', ', '.join(SUPPORTED_ENCODINGS))
+
         req.headers = handle_youtubedl_headers(req.headers)
 
         if sys.version_info < (2, 7) and '#' in req.get_full_url():