index.md

---
title: HTTP reference
short-title: Reference
slug: Web/HTTP/Reference
page-type: listing-page
sidebar: httpsidebar
---

This page lists HTTP reference documentation on MDN.

{{SubPagesWithSummaries}}

The following subsections are also notable:

- [CSP directives](/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy#directives)
  - : The {{HTTPHeader("Content-Security-Policy")}} (CSP) response header allows website administrators to specify which resources the user agent is allowed to load for a given page.
    This section lists directives that can be used in a CSP header, with individual documentation pages that describe how the directives work and how to use them.
- [Permissions-Policy directives](/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy#directives)
  - : The {{HTTPHeader("Permissions-Policy")}} response header provides a mechanism to allow or deny the use of browser features in a document or within any {{HTMLElement("iframe")}} element in the document.
    This section lists directives that can be used in a Permissions-Policy header, with individual documentation pages that describe how the directives work and how to use them.