I had noticed this error on Carthik’s Blog and have since seen/noticed it on a couple of other sites as well. Here is the issue. When a blogging tool (such as WordPress) uses ob_start and then gzip compression to send pages to the client, at times, a (sometimes silent) warning pops up which basically means that the gzip compression is not really taking place. Here is an example of the error: Warning: ob_start(): output handler ‘ob_gzhandler’ cannot be used after ‘URL-Rewriter’ You can check this for your own site/blog by visiting http://www.websiteoptimization.com/services/analyze/ and analyzing your site. Make sure that you have gzip compression turned on in your WordPress control panel (or somewhere on your site, if not on WordPress) and see if the analyzer complains about gzip being turned off. More than likely, you will find that though gzip is turned on, it is not being used. In order to […]