You have not answered my question, how many web server do you have?
Install the Postman on the Web Server and when you make the API GET call
for the url use https://localhost/RSAarcher/contentapi/ or try this
http://localhost/RSAarcher/contentapi/ On...
I see in one of the screenshot you using the https and the last one you
are using httpDo you use the SSL certificate with Archer? If you are
using the SSL certificate go to the Postman > settings> disable the SSL
certificate verification (temporary) ...