Use the HTTP Preview server when you want to quickly test resources in a static Web project. The HTTP Preview server is a Hypertext Transfer Protocol (HTTP) embedded test server that is integrated with the workbench. It is intended for preliminary testing and saves you time to download, install, and set up an HTTP server. However, as your static Web project progresses through its development cycle you are encourage to test and run on an external HTTP server. You can use the HTTP Preview server as a convenient way to check for errors before you do a final test on an external HTTP server.