Feature Header Notification For Free

Permissions Policy, formerly known as Feature Policy, allows the developer to control the browser features available to a page, its iframes, and subresources, by declaring a set of policies for the browser to enforce. These policies are applied to origins provided in a response header origin list.

The HTTP Feature-Policy header provides a mechanism to allow and deny the use of browser features in its own frame, and in content within any <iframe> elements in the document. For more information, see the main Feature Policy article.

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Security headers are directives used by web applications to configure security defenses in web browsers. Based on these directives, browsers can make it harder to exploit client-side vulnerabilities such as Cross-Site Scripting or Clickjacking.

Feature Policy allows web developers to selectively enable, disable, and modify the behavior of certain features and APIs in the browser. It is similar to Content Security Policy but controls features instead of security behavior.

There are two methods by which you can enable feature policies on your site: You can send an HTTP Header, or use the allow attribute on an iframe....The <allowlist> details how the feature can be used ? if at all ? and takes one or more of the following values. self.src.none.<origin(s)>

A header policy is a list of policy directives delivered via an HTTP header with a document.