The plugin has backwards compatibility and works with projects using the original VaRest.
VaRest is the plugin for Unreal Engine that makes REST server communications easier to use.
Plugin is available under MIT open-source license.
https://github.com/AboveConstraints/VaRestX
https://github.com/ufna/VaRest
If you need the latest Unreal Engine version asap, download the develop branch from github (currently 5.6) and build the plugin yourself, there is no guarantee the plugin has been fixed up to new standards and corretly work on the latest release by the time you do it.
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HowTo: Non-trusted connections (http)