- Collector #1151: HTTP compression was broken on error pages

doc/CHANGES.txt

@@ -51,6 +51,8 @@ Zope Changes
 
     Bugs fixed
 
+      - Collector #1151: HTTP compression was broken on error pages
+
       - The REQUEST now contains a new entry ACTUAL_URL which contains the
         full URL without query string as it appears within the location bar of
         the browser. The key has been added to provide a single key that is 

lib/python/ZPublisher/HTTPResponse.py

@@ -351,7 +351,7 @@ class HTTPResponse(BaseResponse):
         self.setHeader('content-length', len(self.body))
         self.insertBase()
         if self.use_HTTP_content_compression and \
-            not self.headers.get('content-encoding',None):
+            self.headers.get('content-encoding', 'gzip') == 'gzip':
             # use HTTP content encoding to compress body contents unless
             # this response already has another type of content encoding
             if content_type.split('/')[0] not in uncompressableMimeMajorTypes: