The content encoding header is meant to be extensible. This is where chrome added sdch and now we&#x27;re about to get brotli compression in Firefox and chrome. If that release of trendmicro was still in use, people wouldn&#x27;t be able to visit Google with chrome nor any upcoming site with brotli support.<p>Also, if they didn&#x27;t like my ps-bzip2 encoding, they could have also stripped it off the clients accept-encoding header, causing the server to not compress the response. But they left it there and just stripped off the content-encoding response header.