The "Web download' in DFL-M510 stands for a network behaviorthat employs HTTP GET command to download files from a web server.When a user clicks a download link and tries to download files, thebrowser sends an HTTP GET request to the web server. At the sametime the file name to be downloaded and the file location are alsosent with the HTTP GET request. By identifying HTTP GET request andthe file extension name, which usually identifies the file formatof the file, DF-M510 is able to know that a user is trying todownload a file.