Use HTTP in InnoSetup

I want to do some HTTP request during the installation of a software with I开发者_StackOverflow中文版nnoSetup. Can I use the class TStream to open an URL as if it was a file or must I use the Exec function with curl.exe being attached in the installer, or is there an easier way ?

Have a look at ISTool and the distributed isxdl.dll. Also Inno Setup comes with the script setup.iss in the examples folder which utilizes the isxdl.dll for downloading additional setup files.