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API Gateway mTLS Basics

Mutual TLS at the edge

Implementing mTLS on an API gateway requires issuing client certs, validating them at the edge, rotating certs, and propagating identities to services while handling fallback/legacy paths carefully.

Issue and Validate

Provide client certs; validate CN/SAN against allowed identities.

Rotate

Automate cert rotation and revocation; short lifetimes.

Propagate

Pass verified identity to services; block downgrade paths.

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