Patrick Sletvold

Content Security Policy Manager is a WordPress plugin that allows you to easily configure <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP" rel="nofollow ugc">Content Security Policy headers</a> for your site. You can have different CSP headers for the admin interface, the frontend for logged in users, and the frontend for regular visitors. The CSP directives can be individually enabled, and each policy can be set to enforce, report or be disabled.
Please note that this plugin offers limited help in figuring out what the contents of the policy should be. It only lets you configure the CSP in a easy to use interface.

Content Security Policy Manager

Plugin for configuring Content Security Policy headers for your site. Allows different CSP headers for admin, logged inn frontend and regular visitors

StampyCode

This plugin addresses the need for a simple way to add HTTP headers to outbound HTTP responses in your site.
These headers can include custom ones specific to your application, or can be security related. Some you may wish to specify to protect your site may include:
<ul>
<li>Public-Key-Pins</li>
<li>Strict-Transport-Security</li>
<li>X-Frame-Options</li>
<li>X-XSS-Protection</li>
<li>X-Content-Type-Options</li>
<li>Content-Security-Policy</li>
<li>Content-Security-Policy-Report-Only</li>
</ul>
<h3>Related Links</h3>
<ul>
<li><a href="http://www.troyhunt.com/2015/09/introducing-you-to-browser-security.html" rel="nofollow ugc">Troy Hunt – Introducing you to browser security headers on Pluralsight</a></li>
<li><a href="https://app.pluralsight.com/library/courses/browser-security-headers" rel="nofollow ugc">PluralSight.com – Introduction to Browser Security Headers</a></li>
<li><a href="https://www.owasp.org/index.php/List_of_useful_HTTP_headers" rel="nofollow ugc">OWASP – List of useful HTTP headers</a></li>
<li><a href="https://scotthelme.co.uk/hardening-your-http-response-headers/" rel="nofollow ugc">Scott Helme – Hardening your HTTP response headers</a></li>
</ul>

Headit

Headit is a simple plugin to allow you to add custom HTTP response headers to your site.

Content Security Policy Manager vs Headit