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From: Eric Wong <bofh@yhbt.net>
To: yahns-public@yhbt.net
Subject: [PATCH] extras/try_gzip_static: set "Vary: Accept-Encoding" on gzip
Date: Sat,  4 Apr 2020 23:50:47 +0000
Message-ID: <20200404235047.16621-1-bofh@yhbt.net> (raw)

Some rare clients may not support gzip.  So ensure cache layers
don't inadvertantly serve cached content to them.
 extras/try_gzip_static.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/extras/try_gzip_static.rb b/extras/try_gzip_static.rb
index 4dd435a..a2dd155 100644
--- a/extras/try_gzip_static.rb
+++ b/extras/try_gzip_static.rb
@@ -79,7 +79,10 @@ def fheader(env, path, st, gz_st = nil, len = nil)
       "Accept-Ranges" => "bytes",
     h["Cache-Control"] = "no-transform" unless mime =~ %r{\Atext\/}
-    h["Content-Encoding"] = "gzip" if gz_st
+    if gz_st
+      h["Content-Encoding"] = "gzip"
+      h["Vary"] = "Accept-Encoding"
+    end

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