Workers,Pagesで国を取得する

これでIP制限の代わりに国で制限をすることも可能

Workers

worker.js

export default {
  async fetch(request, env, ctx) {
    const country = request.headers.get('cf-ipcountry');

    const message = country
      ? `The request is from: ${country}`
      : 'Could not determine the country.';

    return new Response(message);
  },
};

Pages & Hono

index.tsx

import { Hono } from 'hono'
const app = new Hono()

app.get('/', async (c) => {
    const country = c.req.header('cf-ipcountry');
    return c.text(`country: ${country}`);
});

export default app