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Add note about HTTP request headers that users cannot modify #1737

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Jul 8, 2021
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Add note about HTTP request headers that users cannot modify #1737

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2 changes: 2 additions & 0 deletions products/rules/src/content/transform/request-header-modification/index.md
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Expand Up @@ -18,6 +18,8 @@ You can manipulate the headers of incoming HTTP requests through HTTP Request He

* If you modify the value of an existing HTTP request header using an expression that evaluates to an empty string (`""`) or an undefined value, the HTTP request header is **removed**.

* Currently, there is a limited number of HTTP request headers that you cannot modify. Cloudflare may remove restrictions for some of these HTTP request headers when presented with valid use cases. [Create a post in the community](https://community.cloudflare.com) for consideration.

</Aside>

To create an HTTP Request Header Modification Rule in the dashboard, see [Create an HTTP Request Header Modification Rule in the dashboard](/transform/request-header-modification/create-dashboard).
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