The request hits your desk. Secure every app behind a rock-solid gate, but keep it fast. No compromises. You need the right tool: Identity-Aware Proxy with an External Load Balancer.
An Identity-Aware Proxy (IAP) verifies every request before it reaches your backend. It checks the identity of the user, enforces access control, and blocks anonymous traffic at the edge. When paired with an External Load Balancer, it scales that protection to the entire internet-facing surface. You get authentication at Layer 7, routing intelligence, and high availability in one clean setup.
In practice, the External Load Balancer sits in front of your service. IAP integrates directly, intercepting requests and demanding credentials before traffic passes through. OAuth 2.0, service accounts, SAML — all supported. For public endpoints, this means zero trust enforcement without rewriting your application code.
Configuration is straightforward:
- Create the External HTTP(S) Load Balancer.
- Enable Identity-Aware Proxy on the backend service.
- Bind IAM policies to allow access only to approved accounts.
- Test with direct browser and API calls to confirm the block on unauthorized requests.
The combination delivers more than authentication. This setup removes the need for per-service auth logic, centralizes identity checks, and supports large user bases. The load balancer handles SSL termination, URL mapping, and auto-scaling while IAP ensures every packet belongs to someone you trust.
For engineers, this means reduced attack surfaces and simplified application code. For operations, it means consistent security policy across all endpoints. No manual token logic in multiple repos. No custom gateways. One place to manage everything.
Identity-Aware Proxy External Load Balancer configurations have become the standard for secure, scalable, public-facing workloads on cloud platforms. Whether on Google Cloud or multi-cloud with similar patterns, the principle is the same: authentication is enforced before traffic ever reaches your app.
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