Greg - SiteOrigin

I built this plugin to help ease the transition during a DNS changeover, but you can use it any way you please. It turns your WordPress installation into a very simple proxy server. It fetches content from another URL, caches it and displays it. Requests are cached for 24 hours.
Install the plugin, then head over to Settings > Simple Proxy in your WordPress admin. Enter the URL you want to proxy to and when you’re ready to go, also check the enabled checkbox.
You need to have <a href="https://codex.wordpress.org/Using_Permalinks#Choosing_your_permalink_structure" rel="nofollow ugc">pretty permalinks</a> enabled.
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Simple Proxy

Turns your WordPress installation into a simple caching proxy.

luis

This plugin can block “Tor access”, “Proxy Access”, “Commandline Access” and more. 
When it blocks unauthorized access, you can choose setting “Show message” or “Redirect”.
Googlebot,Twitterbot and other crawler can access own wordpress.
<ul>
<li>If you using cache plugin or cache system, this plugin doesn’t run properly. *</li>
</ul>
<h4>list of exception.</h4>
“google”,”msn”,”yahoo”,”bing”,”hatena”, 
“data-hotel”,”twttr.com”,”eset.com”,”linkedin.com”, 
“ahrefs.com”,”webmeup.com”,”grapeshot.co.uk”,”blogmura.com”, 
“apple.com”,”microad.jp”,”linode.com”,”shadowserver.org”,”ezweb.ne.jp”
You can add exceptions IP or UserAgent. 
See more “Secreenshot”.

block-wpscan

This plugin can block "Tor access", "Proxy Access", "Commandline Access" and more. When it blocks unauthorized access.

Simple Proxy vs block-wpscan