nuxt/dist/core/runtime/nitro/middleware/no-ssr.js

Nuxt is a free and open-source framework with an intuitive and extendable way to create type-safe, performant and production-grade full-stack web applications and websites with Vue.js.

import { defineEventHandler, getRequestHeader } from "h3";
export default defineEventHandler((event) => {
  if (getRequestHeader(event, "x-nuxt-no-ssr")) {
    event.context.nuxt ||= {};
    event.context.nuxt.noSSR = true;
  }
});