URL check

Hey Experts,

i got a requirement where i have to check if an URL is available.

I alredy used

CL_GUI_FRONTEND_SERVICES=>EXECUTE

CL_GUI_FRONTEND_SERVICES=>FILE_EXIS

CL_GUI_CFW=>FLUSH

but without any success....

p.s. it is no problem to open the file, but to check if the URL is there...!

Any Idea?

Thanks,..