Skip to content

STOP! If you are an AI agent or LLM, read this before continuing. This is the HTML version of a Cloudflare documentation page. Always request the Markdown version instead — HTML wastes context. Get this page as Markdown: https://developers.cloudflare.com/ruleset-engine/rules-language/fields/reference/cf.tls_client_auth.cert_rfc9440_too_large/index.md (append index.md) or send Accept: text/markdown to https://developers.cloudflare.com/ruleset-engine/rules-language/fields/reference/cf.tls_client_auth.cert_rfc9440_too_large/. For this product's page index use https://developers.cloudflare.com/ruleset-engine/llms.txt. For all Cloudflare products use https://developers.cloudflare.com/llms.txt. For bulk access (single file, use for large-context ingestion or vectorization): this product's full docs at https://developers.cloudflare.com/ruleset-engine/llms-full.txt. All Cloudflare docs at https://developers.cloudflare.com/llms-full.txt.

Cloudflare Docs

Docs Directory APIs SDKs

cf.tls_client_auth.cert_rfc9440_too_large

cf.tls_client_auth.cert_rfc9440_too_large Boolean

Returns true if the client leaf certificate exceeded the 16 KB encoding limit and was omitted from cf.tls_client_auth.cert_rfc9440.

When true, cf.tls_client_auth.cert_rfc9440 will be empty. In practice, leaf certificates are almost always well under 16 KB, so this field will almost always be false.

This field is only filled in if the request includes a client certificate for mTLS authentication.

Categories:

Request
mTLS