ylsine

Do you have a blog that really only want ready by humans? Do think that 
<a href="http://google.com/" rel="nofollow ugc">robots</a> should never be able to read your blog, even if they ignore your robots.txt? Is privacy your number one concern? Do your friends think of you as “that total privacy nut…you know too much so.”? Then this plugin is for you. The 404er will make every public page of your blog return a <a href="http://en.wikipedia.org/wiki/HTTP_404" rel="nofollow ugc">404</a> instead of the normal <a href="http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#2xx_Success" rel="nofollow ugc">200</a>. Yes, you could use the normal <a href="https://codex.wordpress.org/Settings_Privacy_SubPanel" rel="nofollow ugc">privacy subpanel</a>, but that would be sooo pedestrian. Step up to the real (excessive, <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.5" rel="nofollow ugc">RFC abbusing</a>) 404!
Note: If you did not detect any humor in the above text or you do not know what a 404 is, then, in all caps, DO NOT INSTALL THIS PLUGIN!

The 404er

This plugin will send a 404 header for every public page on your blog.

Rik Lewis

bettersecurity

This plugin does not make any changes to your server configuration, such as the .htaccess file, but instead sends the headers as part of the WordPress page response. The reason for this is that many of them are not valid for assets such as stylesheets and images, but are sent anyway if the server configuration method is used.
Unlike many security plugins, these headers are also sent for your admin panel, where security is arguably the most important.
Headers that can be set include… 
* Feature-Policy 
* Referrer-Policy 
* Strict-Transport-Security 
* X-Frame-Options 
* X-Content-Type-Options 
* X-XSS-Protection 
* X-Permitted-Cross-Domain-Policies 
* Expect-CT

Better Headers


Perfect for my needs, allows me to easily add response headers which improves the security of my website.


Perfect for my needs

Improve the security of your website by easily setting HTTP response headers to enable browser protection

The 404er vs Better Headers