A microservices access proxy handles authentication, authorization, routing, and request inspection. It decides who can talk to what. It enforces policies at the edge, before malicious traffic reaches internal systems. Without it, you rely on each service to protect itself, which leads to gaps and inconsistent rules.
Security reviews of an access proxy start with the basics. Verify TLS for all external and internal connections. Check identity providers are properly integrated—whether OAuth2, JWT, or mTLS. Confirm authorization decisions are logged and monitored. Audit rule definitions for clarity and least privilege. Any fuzziness here becomes a breach later.
Modern architectures demand fine-grained control. Map every endpoint exposed through the proxy. Block unused paths. Rate-limit sensitive operations. Use WAF-like inspections on payloads to detect injections, malformed requests, or anomaly patterns. Collect metrics from the proxy and feed them into real-time alerting pipelines.