cosmosvert 0 Newbie Poster

Hello, guys,
I wanna download a file (not a file with filename precised, but a file RAR generated by JS) from a URL HTTPS. To do so, I need to tap LOGIN and PASSWORD first.

I tried several ways, but they did not work :(

Could you please help me? (All the elements known are: URL, LOGIN, Password, Download lien)

Thanks a lot in advance.