Setting up reversed proxy server

index.js

//install wrangle and init a project to initialize the worker

//add the code given below in index.js

import { Hono } from 'hono';
import { cors } from 'hono/cors';

const app = new Hono();

app.use(
	'*',
	cors({
		origin: '*',
		allowHeaders: '*',
		allowMethods: ['GET', 'OPTIONS'],
		maxAge: 600,
	})
);

app.all('*', async (c) => {
	const targetUrl = c.req.query('url');
	if (!targetUrl) {
		return c.text('Missing target URL', 400);
	}

	const url = new URL(targetUrl);
	const targetRequest = new Request(url, {
		method: c.req.method,
		headers: c.req.headers,
		body: ['GET', 'HEAD'].includes(c.req.method) ? null : c.req.body,
	});

	const response = await fetch(targetRequest);

	const newHeaders = new Headers(response.headers);
	newHeaders.set('Access-Control-Allow-Origin', '*');
	newHeaders.set('Access-Control-Allow-Methods', '*');
	newHeaders.set('Access-Control-Allow-Headers', 'Content-Type');

	return new Response(response.body, {
		status: response.status,
		headers: newHeaders,
	});
});

export default app;

// add name of your project (can be any) in wrangler.toml file

//run npx wrangler publish 
// your reversed proxy server is now hosted
// to use the proxy make request like this structure given below
//https://workername.workers.dev/?url=https://<website_name>

✘ [ERROR] Build failed with 2 errors:

✘ [ERROR] Could not resolve "hono"

  src/index.js:5:21:
    5 │ import { Hono } from 'hono';
      ╵                      ~~~~~~

You can mark the path "hono" as external to exclude it from the bundle, which will remove this

error.

✘ [ERROR] Could not resolve "hono/cors"

  src/index.js:6:21:
    6 │ import { cors } from 'hono/cors';
      ╵                      ~~~~~~~~~~~

You can mark the path "hono/cors" as external to exclude it from the bundle, which will remove

this error.

Hm

✘ [ERROR] Build failed with 2 errors:

✘ [ERROR] Could not resolve "hono"

  src/index.js:5:21:
    5 │ import { Hono } from 'hono';
      ╵                      ~~~~~~

You can mark the path "hono" as external to exclude it from the bundle, which will remove this

error.

✘ [ERROR] Could not resolve "hono/cors"

  src/index.js:6:21:
    6 │ import { cors } from 'hono/cors';
      ╵                      ~~~~~~~~~~~

You can mark the path "hono/cors" as external to exclude it from the bundle, which will remove

this error.

run "npm install" before you "wrangler deploy" or use below worker.js:

export default {
  async fetch(request, env, ctx) {
    if (request.method === 'OPTIONS') {
      return handleOptions(request);
    }

    const url = new URL(request.url);
    const targetUrl = url.searchParams.get('url');
    
    if (!targetUrl) {
      return new Response('Missing target URL', { status: 400 });
    }

    try {
      const target = new URL(targetUrl);
      
      const headers = new Headers();
      for (const [key, value] of request.headers) {
        if (!['origin', 'referer'].includes(key.toLowerCase())) {
          headers.set(key, value);
        }
      }

      const response = await fetch(target, {
        method: request.method,
        headers: headers,
        body: request.method === 'GET' || request.method === 'HEAD' ? null : request.body,
      });

      const corsHeaders = {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type, Authorization, *',
        'Access-Control-Max-Age': '600',
      };

      return new Response(response.body, {
        status: response.status,
        headers: {
          ...Object.fromEntries(response.headers),
          ...corsHeaders,
        },
      });
    } catch (error) {
      return new Response('Invalid URL', { status: 400 });
    }
  },
};

function handleOptions(request) {
  return new Response(null, {
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
      'Access-Control-Allow-Headers': 'Content-Type, Authorization, *',
      'Access-Control-Max-Age': '600',
    },
  });
}