HTTPS Authentication with Axel Downloader

Is there a way to use https authentication with Axel to download files? I have gone through this answer and tried what was written, but to no extent. I got
HTTP/1.1 401 Unauthorized
as the output for this input command:
axel -n 60 -k -H "Authorisation: Basic [some hash string]" "https://xxx.rar "
for which the hash string was generated using :
echo -n "username:password" | openssl base64 So ultimately, I want to know, what do I change in the input command to be able to download the file?