A CDN accelerator computer system (32) is described that can allow a website to be provided in a content delivery network (CDN). The CDN accelerator (32) is configured to receive a request for web content from a user (20). Processors in the CDN accelerator can then retrieve HTML source code from an origin server (34) and modify the source code by changing the addresses of static content items to refer to addresses in a CDN. The CDN accelerator (32) can then send the modified HTML source code to the user (20), and the user's browser can acquire the static content items from the CDN.