App Engine To App Engine Communication through a Firewall

There are a few ways to handle this problem. It comes down to the types of consumers you need to allow through the firewall.

On its own, this is probably the least secure because it involves adding a very large range of IP addresses. An attacker could set up their own App Engine app and get access to your application if there isn’t any additional security beyond the firewall. Additionally, this IP range is dynamic. You will have to make sure to update this range regularly.

Technically, this could be any kind of proxy server. But, if you can keep this proxy in your App Engine region, you’ll get better performance. This solution is probably the best option because it allows…

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