Workers - New RFC 9440 mTLS certificate fields in Workers
UpdateUnverifiedAdded Sep 24, 2026
Four new fields are now available on request.cf.tlsClientAuth in Workers for requests that include a mutual TLS (mTLS) client certificate. These fields encode the client certificate and its intermediate chain in RFC 9440 ↗ format , the same standard format used by the Client-Cert and Client-Cert-Chain HTTP headers , so your Worker can forward them directly...
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