A: Hello, yes. Pre-rendering engine sits between a website and bots (like GoogleBot). When page visited by bot pre-rendering visits the website as a regular user would, waits for images, fonts, JavaScript and other assets to finish loading and its execution. Then grabs its final HTML and returns to the bot.

To speed up the response rate entire website can get rendered in advance and keep cache fresh once expired. This is optional features.

Regarding Next.js — we don't have explicit examples. For Node.js compatible apps (like next.js) we have middleware as NPM package. And stack-agnostic methods like Nginx, CloudFlare Workers, Apache, and other

Hope that helps