For more documentation visit the hxfcgi wiki page.

• If you are using FastCGI you should use Web.cacheModule(), otherwise the module will be restarted after every request, which is quite slow.
• If you are using CGI if does not matter if you use Web.cacheModule().
• When setting cache with Web.cacheModule(run), run is called, don't call your run method after caching or it may run twice.
• You need to print some data, when sending headers only, call Lib.print(''); after setting all headers.