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Available Managed Transforms

This page lists the available Managed Transforms. They can modify HTTP request headers or response headers.

For more complex and customized header modifications, consider using Snippets.


HTTP request headers

Add bot protection headers

Adds HTTP headers with bot-related values to the request sent to the origin server:

Add TLS client auth headers

Adds HTTP headers with Mutual TLS (mTLS) client authentication values to the request sent to the origin server:

Add visitor location headers

Adds HTTP headers with location information for the visitor's IP address to the request sent to the origin server:

  • cf-ipcity: The visitor's city (value from the ip.src.city field).
  • cf-ipcountry: The visitor's country (value from the ip.src.country field).
  • cf-ipcontinent: The visitor's continent (value from the ip.src.continent field).
  • cf-iplongitude: The visitor's longitude (value from the ip.src.lon field).
  • cf-iplatitude: The visitor's latitude (value from the ip.src.lat field).
  • cf-region: The visitor's region (value from the ip.src.region field).
  • cf-region-code: The visitor's region code (value from the ip.src.region_code field).
  • cf-metro-code: The visitor's metro code (value from the ip.src.metro_code field).
  • cf-postal-code: The visitor's postal code (value from the ip.src.postal_code field).
  • cf-timezone: The name of the visitor's timezone (value from the ip.src.timezone.name field).

Encoding of non-ASCII header values

Cloudflare always converts non-ASCII characters to UTF-8 (using hexadecimal character representation) in HTTP request and response header values. This applies to location headers added by the Add visitor location headers managed transform.

For example, the header value São Paulo would be encoded as S\u00c3\u00a3o Paulo.

Add "True-Client-IP" header

Adds a true-client-ip request header with the visitor's IP address.

This Managed Transform is unavailable when Remove visitor IP headers is enabled.

Remove visitor IP headers

Removes HTTP headers that may contain the visitor's IP address from the request sent to the origin server. Handles the following HTTP request headers:

  • cf-connecting-ip
  • x-forwarded-for (refer to the notes below)
  • true-client-ip

This Managed Transform is unavailable when Add "True-Client-IP" header is enabled.

Visitor IP address in the x-forwarded-for HTTP header

For the x-forwarded-for HTTP request header, enabling Remove visitor IP headers will only remove the visitor IP from the header value when Cloudflare receives a request proxied by at least another CDN (content delivery network). In this case, Cloudflare will only keep the IP address of the last proxy.

For example, consider an incoming request proxied by two CDNs (CDN_1 and CDN_2) before reaching the Cloudflare network. The x-forwarded-for header would be similar to the following:
x-forwarded-for: <VISITOR_IP>, <THIRD_PARTY_CDN_1_IP>, <THIRD_PARTY_CDN_2_IP>

With Remove visitor IP headers enabled, the x-forwarded-for header sent to the origin server will be:
x-forwarded-for: <THIRD_PARTY_CDN_2_IP>

Add Leaked Credentials Checks Header

Adds an Exposed-Credential-Check request header whenever the WAF detects leaked credentials in the incoming request.

The header can have these values:

Header + ValueDescriptionAvailability
Exposed-Credential-Check: 1Previously leaked username and password detectedPro plan and above
Exposed-Credential-Check: 2Previously leaked username detectedEnterprise plan
Exposed-Credential-Check: 3Similar combination of previously leaked username and password detectedEnterprise plan
Exposed-Credential-Check: 4Previously leaked password detectedAll plans

You will only receive this managed header at your origin server if:

  • The leaked credentials detection in the WAF is turned on.
  • The Add Leaked Credentials Checks Header managed transform is turned on.
  • Your Cloudflare plan supports the type of credentials detection. For example, Free plans can only know if a password was previously leaked. In this situation, Cloudflare will add an Exposed-Credential-Check: 4 header to the request.

HTTP response headers

Remove "X-Powered-By" headers

Removes the X-Powered-By HTTP response header that provides information about the application at the origin server that handled the request.

Add security headers

Adds several security-related HTTP response headers. The added response headers and values are the following:

  • x-content-type-options: nosniff
  • x-xss-protection: 1; mode=block
  • x-frame-options: SAMEORIGIN
  • referrer-policy: same-origin
  • expect-ct: max-age=86400, enforce

To increase protection, enable HTTP Strict Transport Security (HSTS) for your website.

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