Andrea De Giovine

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This plugin adds a set of protection rules to the .htaccess file of your WordPress site. 
These rules totally protect the CMS from hacker attacks.
This is a BETA version, if you find bugs or malfunctions contact the developer from the support section.
<h3>WP Firewall requirements</h3>
<ul>
<li>Apache web server</li>
<li>ModRewite</li>
<li>SSL connection (https)</li>
</ul>
<h3>WP Firewall development functions</h3>
This plugin uses only functions contained in the CMS core.
Do you need other functions? Ask the developer from the support section.
If after activating the protection errors or white screens occur, access the .htaccess file and remove all the code between “# BEGIN Firewall” and “# END Firewall”.
<h3>WP Firewall credits</h3>
The “WP Firewall” plugin was entirely designed and created by Andrea De Giovine (thought by @riccardobastillo1). 
If you like the idea and want to support the developer, please <a href="https://www.andreadegiovine.it/outlinks/1422/?utm_source=wordpress_org&utm_medium=plugin_page&utm_campaign=wp_firewall" title="send donation" rel="nofollow ugc">donate to this plugin</a>. 
For collaborations and consultations visit the website of the <a href="https://www.andreadegiovine.it/?utm_source=wordpress_org&utm_medium=plugin_page_text&utm_campaign=wp_firewall" title="Web developer freelance" rel="nofollow ugc">freelance web developer</a>. 
For bug reports and support for this plugin, visit the <a href="https://wordpress.org/support/plugin/wp-firewall/" title="Go to support" rel="ugc">support</a> section to ask the developer and the community directly.

WP Firewall

Protect WordPress from hacker attacks, spam and dangerous actions.

stasionok

With this simple plugin you can restrict extra external requests made with internal WordPress WP_Http class. 
Just put in the filter rules field what you wish to restrict. One url part or url regex per line. 
By default, the plugin returns WP_Error answer for restricted requests. But you can put in response your custom response data.

ROB (rat out blocker)

Restrict execution of certain external requests with partial url or even regex to prevent personal data leakage (as example)

WP Firewall vs ROB (rat out blocker)