Fields reference

Represents the entire cookie as a string.

Example value:
session=8521F670545D7865F79C3D7BEDC29CCE;-background=light

Represents the host name used in the full request URI.

Example value:
www.example.org

Represents the HTTP Referer request header, which contains the address of the web page that linked to the currently requested page.

Example value:
Referer: htt­ps://developer.example.org/en-US/docs/Web/JavaScript

Represents the full URI as received by the web server (does not include #fragment, which is not sent to web servers).

Example value:
htt­ps://www.example.org/articles/index?section=539061&expand=comments

Represents the HTTP method, returned as a string of uppercase characters.

Example value:
GET

Represents the Cookie HTTP header associated with a request as a Map (associative array).

The cookie values are not pre-processed and retain the original case used in the request.

Decoding: The cookie names are URL decoded. If two cookies have the same name after decoding, their value arrays are merged.

Example:
any(http.request.cookies["app"][*] == "test")

Example value:
{"app": ["test"]}

Represents the timestamp when Cloudflare received the request, expressed as Unix time in seconds. This value is 10 digits long.

To obtain the timestamp milliseconds, use the http.request.timestamp.msec field.

Example value:
1484063137

When validating HMAC tokens in an expression, pass this field as the currentTimestamp argument to the is_timed_hmac_valid_v0() validation function.

Represents the millisecond when Cloudflare received the request, between 0 and 999.

To obtain the complete timestamp, use both http.request.timestamp.sec and http.request.timestamp.msec fields.

Example value:
857

Represents the URI path and query string of the request.

Example value:
/articles/index?section=539061&expand=comments

Represents the URI path of the request.

Example value:
/articles/index

Represents the entire query string, without the ? delimiter.

Example value:
section=539061&expand=comments

Represents the HTTP user agent, a request header that contains a characteristic string to allow identification of the client operating system and web browser.

Example value:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Represents the version of the HTTP protocol used. Use this field when you require different checks for different versions.

Example Values:

• HTTP/1.1
• HTTP/3

Represents the full X-Forwarded-For HTTP header.

Example value:
203.0.113.195, 70.41.3.18

Represents the client TCP IP address, which may be adjusted to reflect the actual address of the client by using, for example, HTTP headers such as X-Forwarded-For or X-Real-IP.

Example value:
93.184.216.34

Represents the latitude associated with the client IP address.

Example value:
37.78044

Note: This field is only available in Transform Rules.

Represents the longitude associated with the client IP address.

Example value:
-122.39055

Note: This field is only available in Transform Rules.

Represents the city associated with the client IP address.

Example value:
San Francisco

Note: This field is only available in Transform Rules.

Represents the 16- or 32-bit integer representing the Autonomous System (AS) number associated with client IP address.

• AF – Africa
• AN – Antarctica
• AS – Asia
• EU – Europe
• NA – North America
• OC – Oceania
• SA – South America
• T1 – Tor network

Represents the 2-letter country code in ISO 3166-1 Alpha 2 format.

Example value:
GB

For more information on the ISO 3166-1 Alpha 2 format, refer to ISO 3166-1 Alpha 2 on Wikipedia.

Represents the ISO 3166-2 code for the first level region associated with the IP address. When the actual value is not available, this field contains an empty string.

Example value:
GB-ENG

For more information on the ISO 3166-2 standard and the available regions, refer to ISO 3166-2 on Wikipedia.

Represents the ISO 3166-2 code for the second level region associated with the IP address. When the actual value is not available, this field contains an empty string.

Example value:
GB-SWK

For more information on the ISO 3166-2 standard and the available regions, refer to ISO 3166-2 on Wikipedia.

Returns true when the request originates from an EU country.

Similar to the http.request.full_uri non-raw field. Represents the full URI as received by the web server without the URI fragment (if any) and without any transformation.

Note: This raw field may include some basic normalization done by Cloudflare's HTTP server. However, this can change in the future.

Similar to the http.request.uri non-raw field. Represents the URI path and query string of the request without any transformation.

Note: This raw field may include some basic normalization done by Cloudflare's HTTP server. However, this can change in the future.

Similar to the http.request.uri.path non-raw field. Represents the URI path of the request without any transformation.

Note: This raw field may include some basic normalization done by Cloudflare's HTTP server. However, this can change in the future.

Similar to the http.request.uri.query non-raw field. Represents the entire query string without the ? delimiter and without any transformation.

Note: This raw field may include some basic normalization done by Cloudflare's HTTP server. However, this can change in the future.

Returnstrue when the HTTP connection to the client is encrypted.

cf.bot_management.verified_bot
Boolean

When true, this field indicates the request originated from a known good bot or crawler. Provides the same information as cf.client.bot.

cf.bot_management.score
Number

Represents the likelihood that a request originates from a bot using a score from 1–99.

A low score indicates that the request comes from a bot or an automated agent. A high score indicates that a human issued the request.

cf.bot_management.ja3_hash
String

Provides an SSL/TLS fingerprint to help you identify potential bot requests.

For more details, refer to JA3 Fingerprints.

When true, this field indicates the request originated from a known good bot or crawler. Provides the same information as cf.bot_management.verified_bot.

Represents the edge IP address to which the HTTP request has resolved to.

This field is only meaningful for BYOIP customers.

Represents the port number at which Cloudflare's network received the request.

Use this field to filter traffic on a specific port. The value is a port number in the range 1–65535.

Returns the string representation of the per-hostname custom metadata JSON object set by SSL for SaaS customers.

Represents a Cloudflare threat score from 0–100, where 0 indicates low risk. Values above 10 may represent spammers or bots, and values above 40 identify bad actors on the Internet.

It is rare to see values above 60. A common recommendation is to challenge requests with a score above 10 and to block those above 50.

Returns true when a request presents a valid but revoked client certificate.

When true, the cf.tls_client_auth.cert_verified field is also true.

Returns true when a request presents a valid client certificate.

Also returns true when a request includes a valid certificate that was revoked (see cf.tls_client_auth.cert_revoked).

Identifies whether a request comes from a worker or not.

When a request comes from a worker, this field will hold the name of the zone for that worker. Otherwise cf.worker.upstream_zone is empty

cf.colo.name
String

cf.colo.region
String

icmp
String

icmp.type
Number

icmp.code
Number

ip
String

ip.dst
IP Address

ip.geoip.country
String

For more information on the ISO 3166-1 Alpha 2 format, refer to ISO 3166-1 Alpha 2 on Wikipedia.

ip.hdr_len
Number

ip.len
Number

ip.opt.type
Number

ip.proto
String

ip.src
IP Address

ip.ttl
Number

tcp
String

tcp.flags
Number

tcp.flags.ack
Boolean

tcp.flags.cwr
Boolean

tcp.flags.ecn
Boolean

tcp.flags.fin
Boolean

tcp.flags.push
Boolean

tcp.flags.reset
Boolean

tcp.flags.syn
Boolean

tcp.flags.urg
Boolean

tcp.srcport
Number

tcp.dstport
Number

udp
String

udp.dstport
Number

udp.srcport
Number

Represents the HTTP URI arguments associated with a request as a Map (associative array).

When an argument repeats, then the array contains multiple items in the order they appear in the request.

The values are not pre-processed and retain the original case used in the request.

Decoding: no decoding performed
Non-ASCII: preserved

Example:
any(http.request.uri.args["search"][*] == "red+apples")

Example value:
{"search": ["red+apples"]}

Represents the names of the arguments in the HTTP URI query string. The names are not pre-processed and retain the original case used in the request.

When a name repeats, the array contains multiple items in the order that they appear in the request.

Decoding: no decoding performed
Non-ASCII: preserved

Example:
any(http.request.uri.args.names[*] == "search")

Example value:
["search"]

Represents the values of arguments in the HTTP URI query string. The values are not pre-processed and retain the original case used in the request. They are in the same order as in the request.

Duplicated values are listed multiple times.

Decoding: no decoding performed
Non-ASCII: preserved

Example:
any(http.request.uri.args.values[*] == "red+apples")

Example value:
["red+apples"]

Contains the same field values as http.request.uri.args.

Contains the same field values as http.request.uri.args.names.

Contains the same field values as http.request.uri.args.values.

Represents HTTP request headers as a Map (or associative array).

The keys of the associative array are the names of HTTP request headers converted to lowercase.

When there are repeating headers, the array includes them in the order they appear in the request.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example:
any(http.request.headers["content-type"][*] == "application/json")

Example value:
{"content-type": ["application/json"]}

Represents the names of the headers in the HTTP request.

The names are not pre-processed and retain the original case used in the request.

Note: In HTTP/2 the names of HTTP headers are always in lowercase. Recent versions of the curl tool enable HTTP/2 by default for HTTPS connections.

The order of header names is not guaranteed but will match http.request.headers.values.

Duplicate headers are listed multiple times.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example:
any(http.request.headers.names[*] == "content-type")

Example value: ["content-type"]

Represents the values of the headers in the HTTP request.

The values are not pre-processed and retain the original case used in the request.

The order of header values is not guaranteed but will match http.request.headers.names.

Duplicate headers are listed multiple times.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example 1:
any(http.request.headers.values[*] == "application/json")

Example value 1:
["application/json"]

Additionally used to match requests according to the specified operator and the length/size entered for the header value.

Example 2:
any(len(http.request.headers.values[*])[*] gt 10)

Example value 2:
["This header value is longer than 10 bytes"]

Returns true when the HTTP request contains too many headers; otherwise, returns false.

When true, http.request.headers, http.request.headers.names, and http.request.headers.values may not contain all of the headers sent in the HTTP request.

Represents the list of language tags provided in the Accept-Language HTTP request header, sorted by weight (;q=<weight>, with a default weight of 1) in descending order.

If the HTTP header is not present in the request or is empty, http.request.accepted_languages[0] will return a "missing value", which the concat() function will handle as an empty string.

If the HTTP header includes the language tag * it will not be stored in the array.

Example 1:
Request with header Accept-Language: fr-CH, fr;q=0.8, en;q=0.9, de;q=0.7, *;q=0.5. In this case:
http.request.accepted_languages[0] == "fr-CH"
http.request.accepted_languages == ["fr-CH", "en", "fr", "de"]

Example 2:
Request without an Accept-Language HTTP header and a URI of https://www.example.com/my-path. In this case:
concat("/", http.request.accepted_languages[0], http.request.uri.path) == "//my-path".

Note: This field is only available in Transform Rules.

Represents the unaltered HTTP request body.

When the value of http.request.body.truncated is true, the return value may be truncated.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Indicates whether the HTTP request body is truncated.

When true, http.request.body fields may not contain all of the HTTP request body.

Represents the HTTP request body of a form as a Map (or associative array). Populated when the Content-Type header is application/x-www-form-urlencoded.

The values are not pre-processed and retain the original case used in the request.

When a field repeats, then the array contains multiple items in the order they are in the request.

The return value may be truncated if http.request.body.truncated is true.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example:
any(http.request.body.form["username"][*] == "admin")

Example value:
{username": ["admin"]}

Represents the names of the form fields in an HTTP request where the content type is application/x-www-form-urlencoded.

The names are not pre-processed and retain the original case used in the request. They are listed in the same order as in the request.

Duplicate names are listed multiple times.

The return value may be truncated if http.request.body.truncated is true.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example:
any(http.request.body.form.names[*] == "username")

Example value:
["username"]

Represents the values of the form fields in an HTTP request where the content type is application/x-www-form-urlencoded.

The values are not pre-processed and retain the original case used in the request. They are listed in the same order as in the request.

Duplicated values are listed multiple times.

The return value may be truncated if http.request.body.truncated is true.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example:
any(http.request.body.form.values[*] == "admin")

Example value:
["admin"]

Represents the HTTP status code returned by the origin.

Example value:
403

Represents HTTP response headers as a Map (or associative array).

When there are repeating headers, the array includes them in the order they appear in the response. The keys convert to lowercase.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example:
any(http.response.headers["server"][*] == "nginx")

Example value:
{"server": ["nginx"]}

Represents the names of the headers in the HTTP response. The names are not pre-processed and retain the original case used in the response.

The order of header names is not guaranteed but will match http.response.headers.values.

Duplicate headers are listed multiple times.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example:
any(http.response.headers.names[*] == "content-type")

Example value: ["content-type"]

Represents the values of the headers in the HTTP response.

The values are not pre-processed and retain the original case used in the response.

The order of header values is not guaranteed but will match http.response.headers.names.

Duplicate headers are listed multiple times.

Decoding: no decoding performed
Whitespace: preserved
Non-ASCII: preserved

Example 1:
any(http.response.headers.values[*] == "application/json")

Example value 1:
["application/json"]

Additionally used to match responses according to the specified operator and the length/size entered for the header value.

Example 2:
any(len(http.response.headers.values[*])[*] gt 10)

Example value 2:
["This header value is longer than 10 bytes"]