title: Restrict one of public api endpoinds for aws ec2 and lambda
body: <p>I have my infrastructure on AWS. There is ec2 as a backend server, a lambda that sends requests to this the ec2 backend code on one endpoint called '.../utility'. This '.../utility' endpoint is open to the internet.</p>
  <p>So how can I hide '.../utility' endpoint from public access in the internet, but the other backend endpoints left public as they are? And so that lambda can send requests to '.../utility' inside AWS privately?</p>