This section contains reference information on HTTP Response Header Modification Rules.

* [Format of header names and values](https://developers.cloudflare.com/rules/transform/response-header-modification/reference/header-format/)
* [Available fields and functions](https://developers.cloudflare.com/rules/transform/response-header-modification/reference/fields-functions/)
* [API parameter reference](https://developers.cloudflare.com/rules/transform/response-header-modification/reference/parameters/)
