Rick Beckman

Adds to search results and archive pages the total number of posts available as well as an indicator as to which batch of posts are currently being displayed, for example “11-20 of 124.” This plugin is a remix of <a href="https://wordpress.org/extend/plugins/results-count" rel="ugc">Results Count</a> by Matthew Taylor, and it is optimized for <a href="http://get-thesis.com/" rel="nofollow ugc">the Thesis theme framework</a>.
Say you have a category named “Videos” with 432 posts; visiting the third page of that archive would show you posts 21-30 (assuming 10 posts per page); with this plugin, this information would be available to your users at a glance:
<pre><code>21–30 of 432 entries categorized:
<h1>Videos</h1>
</code></pre>
Search results and the following archive types are taken into account by this plugin: day, month, year, author, category, and tag.

Results Count Remix

Adds both the number of displayed posts as well as the total number of returned posts to search and archive pages.

Dimitar Ivanov

HTTP Headers gives your control over the http headers returned by your blog or website.
Headers supported by HTTP Headers includes:
<ul>
<li>Access-Control-Allow-Origin</li>
<li>Access-Control-Allow-Credentials</li>
<li>Access-Control-Max-Age</li>
<li>Access-Control-Allow-Methods</li>
<li>Access-Control-Allow-Headers</li>
<li>Access-Control-Expose-Headers</li>
<li>Age </li>
<li>Content-Security-Policy</li>
<li>Content-Security-Policy-Report-Only</li>
<li>Cache-Control</li>
<li>Clear-Site-Data</li>
<li>Connection</li>
<li>Content-Encoding</li>
<li>Content-Type</li>
<li>Cross-Origin-Embedder-Policy</li>
<li>Cross-Origin-Opener-Policy</li>
<li>Cross-Origin-Resource-Policy</li>
<li>Expect-CT</li>
<li>Expires</li>
<li>Feature-Policy</li>
<li>NEL</li>
<li>Permissions-Policy</li>
<li>Pragma</li>
<li>P3P</li>
<li>Referrer-Policy</li>
<li>Report-To</li>
<li>Strict-Transport-Security</li>
<li>Timing-Allow-Origin</li>
<li>Vary</li>
<li>WWW-Authenticate</li>
<li>X-Content-Type-Options</li>
<li>X-DNS-Prefetch-Control</li>
<li>X-Download-Options</li>
<li>X-Frame-Options</li>
<li>X-Permitted-Cross-Domain-Policies</li>
<li>X-Powered-By</li>
<li>X-Robots-Tag</li>
<li>X-UA-Compatible</li>
<li>X-XSS-Protection</li>
</ul>

HTTP Headers

Great plugin with a huge amount of settings. Despite the complexity of the setup, the developers have added comments with links to full help. It helps a lot that the comments are also translated into Russian.
After setting up the plugin, be sure to check both the functionality of the site and the speed indicators. Some settings may slow down the site loading speed.

Wonderful

HTTP Headers adds CORS & security HTTP headers to your website.

Results Count Remix vs HTTP Headers