---
title: Create a request header transform rule in the dashboard · Cloudflare Rules docs
description: Refer to the Rules examples gallery for examples of rule definitions.
lastUpdated: 2025-04-15T11:19:33.000Z
source_url:
  html: https://fd082a90.preview.developers.cloudflare.com/rules/transform/request-header-modification/create-dashboard/index.md
  md: https://fd082a90.preview.developers.cloudflare.com/rules/transform/request-header-modification/create-dashboard/
---

Refer to the [Rules examples gallery](https://developers.cloudflare.com/rules/transform/examples/?operation=Request+modification) for examples of rule definitions.

To create a rule:

1. Log in to the [Cloudflare dashboard](https://dash.cloudflare.com/), and select your account and website.

2. Go to **Rules** > **Overview**.

3. Select **Create rule** > **Request Header Transform Rule**.

4. (Optional) Select one of the rule templates that address common use cases. Then, review and adjust the proposed rule configuration.

5. Enter a descriptive name for the rule in **Rule name**.

6. Under **When incoming requests match**, select if you wish to apply the rule to all incoming requests or only to requests that match a custom filter expression.

7. (Optional) To define a custom expression, use the Expression Builder (specifying one or more values for **Field**, **Operator**, and **Value**) or manually enter an expression using the Expression Editor. For more information, refer to [Edit expressions in the dashboard](https://developers.cloudflare.com/ruleset-engine/rules-language/expressions/edit-expressions/).

   Note

   Check the [available fields and functions](https://developers.cloudflare.com/rules/transform/request-header-modification/reference/fields-functions/).

8. For **Modify request header**, select one of the following options:

   * *Set static* — Sets the value of an HTTP request header to a static string value. Overrides the value of an existing header with the same name or adds a new header if it does not exist.
   * *Set dynamic* — Sets the value of an HTTP request header according to the provided expression. Overrides the value of an existing header with the same name or adds a new header if it does not exist.
   * *Remove* — Removes the HTTP request header with the provided name, if it exists.

9. Enter the name of the HTTP request header to modify in **Header name** and the static value or expression in **Value**, if you are setting the header value.

10. To modify another HTTP request header in the same rule, select **Set new header**. You can modify up to 30 HTTP request headers in a single rule.

    The following example includes the modification of three headers:

    ![Example configuration performing three request header modifications: set a dynamic header value, set a static header value, and remove an existing header.](https://developers.cloudflare.com/_astro/request-header-modification-example.CKUUJ7cw_1AJD1c.webp)

11. To save and deploy your rule, select **Deploy**. If you are not ready to deploy your rule, select **Save as Draft**.

    If you are matching a hostname in your rule expression, you may be prompted to create a proxied DNS record for that hostname. Refer to [Troubleshooting](https://developers.cloudflare.com/rules/reference/troubleshooting/#this-rule-may-not-apply-to-your-traffic) for more information.
