Chain

With the wget example below, you can download a file when HTTP auth is required.

wget --http-user=<username> --http-password=<password> --ca-certificate='chain1.pem' 'https://www.example.com/site/file.bin' -O file.bin

Form-based authenticatie wget example using a session cookie…

wget --post-data='UserName=<username>&Password=<password>' --ca-certificate='chain2.pem' --cookies=on --keep-session-cookies --save-cookies=cookie.txt 'https://login.example.com/auth' -O result.txt

wget --referer='https://login.example.com/auth' --ca-certificate='chain2.pem' --cookies=on --keep-session-cookies --load-cookies=cookie.txt 'https://www.example.com/site/file.bin' -O file.bin