Nginx
What is an NGINX server? - Quora
https://www.quora.com/What-is-an-NGINX-server
Apache
General
When using node.js, do you still need Nginx or Apache? - Quora
https://www.quora.com/When-using-node-js-do-you-still-need-Nginx-or-ApacheNGINX vs. Apache (Pro/Con Review, Uses, & Hosting for Each) - HostingAdvice.com
https://www.hostingadvice.com/how-to/nginx-vs-apache/