In some cases, Akamai may need to add auth basic to incoming request before sending it to the origin. Here is how to:
1) encode the username and password in the format of username:password. It can be done either via bash script or the online tool.
# echo -n username:password | base64
2) Add a behavior in Akamai to modify the incoming request header to add Authorization header, and also you may need to remove the Authorization header in the outgoing response header.