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Available fields and functions

Last updated May 4, 2026|Copy as Markdown|View as Markdown|Agent setup

OverviewFilter expressionsRewrite expressions

Filter expressions

A URL rewrite rule filter expression (that is, the expression that defines which incoming requests match the rule) can include the following fields:

cf.edge.server_ip

cf.edge.server_port

cf.edge.client_port

cf.edge.client_tcp

cf.edge.l4.delivery_rate

cf.hostname.metadata

cf.zone.name

cf.random_seed

cf.ray_id

cf.timings.client_quic_rtt_msec

cf.timings.client_tcp_rtt_msec

cf.tls_version

cf.tls_cipher

cf.tls_client_hello_length

cf.tls_client_random

cf.tls_client_extensions_sha1

cf.tls_client_extensions_sha1_le

cf.tls_client_ciphers_sha1

cf.tls_client_auth.*

cf.worker.upstream_zone

http.cookie

http.host

http.referer

http.request.accepted_languages

http.request.cookies

http.request.headers

http.request.headers.*

http.request.method

http.request.timestamp.sec

http.request.timestamp.msec

http.request.full_uri

http.request.uri

http.request.uri.*

http.request.version

raw.http.request.full_uri

raw.http.request.headers

raw.http.request.headers.*

raw.http.request.uri

raw.http.request.uri.*

http.user_agent

http.x_forwarded_for

ip.src

ip.src.lat

ip.src.lon

ip.src.asnum

ip.src.city

ip.src.country

ip.src.continent

ip.src.metro_code

ip.src.postal_code

ip.src.region

ip.src.region_code

ip.src.is_in_european_union

ip.src.subdivision_1_iso_code

ip.src.subdivision_2_iso_code

ssl

cf.worker.upstream_zone

Refer to Fields for reference information on these fields.

Important

To obtain the value of an HTTP request header using the http.request.headers field, specify the header name in lowercase. For example, to get the first value of the Accept-Encoding request header in an expression, use: http.request.headers["accept-encoding"][0].

Use the to_string() function to get the string representation of a non-string value like an Integer value.

For information on the available functions, refer to Functions.

Rewrite expressions

A rewrite expression (that is, the expression that defines the dynamic URL rewrite to perform) can only include the following fields:

http.request.uri.*

http.request.headers.*

http.request.accepted_languages

Refer to the Fields reference for more information on these fields.

The concat(), regex_replace(), and wildcard_replace() functions can appear only once in a rewrite expression. Additionally, you cannot nest the regex_replace() and wildcard_replace() functions.

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