Get data from a website with login credentials

I am trying to get data from a website with login credentials. I have tried getting data from web and setting Basic credentials in data source settings. It threw an error message "Web.BrowserContents currently supports only anonymous credentials."

Then I tried to set credentials as Anonymous in data source settings, used advanced mode while getting data from web, set 'HTTP request header parameter(optional)' as 'Authorization',   and encoded  [username]:[passwprd] using https://www.base64encode.org/

used the encoded username and password preceded with 'Basic'.

I still could not log in.

Is there any other way to get data from a website with login credentials?