Available fields and functions

The available fields when setting an HTTP response header value using an expression are the following:

• cf.bot_management.*
• cf.client.bot
• cf.verified_bot_category
• 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
• cf.fraud.email_risk
• http.cookie
• http.host
• http.referer
• http.request.accepted_languages
• http.request.cookies
• http.request.headers
• http.request.headers.*
• http.request.method
• http.request.body.form
• http.request.body.form.*
• http.request.body.multipart
• http.request.body.multipart.*
• http.request.body.raw
• http.request.body.size
• http.request.body.truncated
• 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.uri
• raw.http.request.uri.*
• raw.http.request.headers
• raw.http.request.headers.*
• 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

• http.response.code
• http.response.content_type.media_type
• http.response.headers
• http.response.headers.*
• raw.http.response.headers
• raw.http.response.headers.*
• cf.response.1xxx_code
• cf.response.error_type
• cf.timings.edge_msec
• cf.timings.origin_ttfb_msec
• cf.timings.worker_msec

Refer to Fields for reference information on these fields.

Important

• To obtain the value of an HTTP header using the http.request.headers or http.response.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 example, to_string(cf.bot_management.score).

For information on the available functions, refer to Functions.