Bulk origin override

JavaScript

export default {
  async fetch(request) {
    /**
     * An object with different URLs to fetch
     * @param {Object} ORIGINS
     */
    const ORIGINS = {
      "starwarsapi.yourdomain.com": "swapi.dev",
      "google.yourdomain.com": "www.google.com",
    };

    const url = new URL(request.url);

    // Check if incoming hostname is a key in the ORIGINS object
    if (url.hostname in ORIGINS) {
      const target = ORIGINS[url.hostname];
      url.hostname = target;
      // If it is, proxy request to that third party origin
      return fetch(url.toString(), request);
    }
    // Otherwise, process request as normal
    return fetch(request);
  },
};

TypeScript

export default {
  async fetch(request): Promise<Response> {
    /**
     * An object with different URLs to fetch
     * @param {Object} ORIGINS
     */
    const ORIGINS = {
      "starwarsapi.yourdomain.com": "swapi.dev",
      "google.yourdomain.com": "www.google.com",
    };

    const url = new URL(request.url);

    // Check if incoming hostname is a key in the ORIGINS object
    if (url.hostname in ORIGINS) {
      const target = ORIGINS[url.hostname];
      url.hostname = target;
      // If it is, proxy request to that third party origin
      return fetch(url.toString(), request);
    }
    // Otherwise, process request as normal
    return fetch(request);
  },
} satisfies ExportedHandler;

Hono

import { Hono } from "hono";
import { proxy } from "hono/proxy";

// An object with different URLs to fetch
const ORIGINS: Record<string, string> = {
  "starwarsapi.yourdomain.com": "swapi.dev",
  "google.yourdomain.com": "www.google.com",
};

const app = new Hono();

app.all("*", async (c) => {
  const url = new URL(c.req.url);

  // Check if incoming hostname is a key in the ORIGINS object
  if (url.hostname in ORIGINS) {
    const target = ORIGINS[url.hostname];
    url.hostname = target;

    // If it is, proxy request to that third party origin
    return proxy(url, c.req.raw);
  }

  // Otherwise, process request as normal
  return proxy(c.req.raw);
});

export default app;

Python

from js import fetch, URL

async def on_fetch(request):
    # A dict with different URLs to fetch
    ORIGINS = {
      "starwarsapi.yourdomain.com": "swapi.dev",
      "google.yourdomain.com": "www.google.com",
    }

    url = URL.new(request.url)

    # Check if incoming hostname is a key in the ORIGINS object
    if url.hostname in ORIGINS:
        url.hostname = ORIGINS[url.hostname]
        # If it is, proxy request to that third party origin
        return fetch(url.toString(), request)

    # Otherwise, process request as normal
    return fetch(request)