lib/rack/deflater.rb in rack-1.4.7 vs lib/rack/deflater.rb in rack-1.5.0.beta.1

@@ -14,10 +14,11 @@
       headers = Utils::HeaderHash.new(headers)
 
       # Skip compressing empty entity body responses and responses with
       # no-transform set.
       if Utils::STATUS_WITH_NO_ENTITY_BODY.include?(status) ||
-          headers['Cache-Control'].to_s =~ /\bno-transform\b/
+          headers['Cache-Control'].to_s =~ /\bno-transform\b/ ||
+         (headers['Content-Encoding'] && headers['Content-Encoding'] !~ /\bidentity\b/)
         return [status, headers, body]
       end
 
       request = Request.new(env)