add workers.dev domain support

README.md

@@ -35,6 +35,19 @@ Free domain name application:
 const currentDomain = "example.com";
 ```
 
+#### Use workers.dev default domain?
+
+This method only supports single domain reverse proxy.
+
+Here is the code:
+
+[workers.dev/index.js](workers.dev/index.js)
+
+```js
+// replace to your proxy site domain
+const proxySite = 'example.com';
+```
+
 ### 3. deploy to workers
 
 ```sh

workers.dev/index.js

@@ -0,0 +1,50 @@
+addEventListener('fetch', event => {
+  event.respondWith(handleRequest(event.request));
+});
+
+async function handleRequest(request) {
+  const url = new URL(request.url);
+  const host = url.host;
+
+  if (url.pathname === '/robots.txt') {
+    const robots = `User-agent: *
+Disallow: /
+    `;
+   return new Response(robots,{ status: 200 });
+  }
+
+
+  const proxySite = 'www.proxysites.ai';
+  const urlPath = url.pathname;
+  const origin = `https://${proxySite}`; 
+  const actualUrl = new URL(`${origin}${urlPath}${url.search}${url.hash}`); 
+
+  const modifiedRequestInit = {
+    method: request.method,
+    headers: request.headers,
+    redirect: 'follow'
+  };
+
+  if (!['GET', 'HEAD'].includes(request.method)) {
+    const requestBody = await request.clone().arrayBuffer();
+    modifiedRequestInit.body = requestBody;
+  }
+
+  const modifiedRequest = new Request(actualUrl, modifiedRequestInit);
+
+  const response = await fetch(modifiedRequest);
+
+  let body = await response.arrayBuffer();
+  const contentType = response.headers.get('content-type');
+
+  if (contentType && (contentType.includes('text/') || contentType.includes('application/x-javascript'))) {
+    let text = new TextDecoder('utf-8').decode(body);
+    text = text.replace(new RegExp( proxySite, 'g'), host );
+    body = new TextEncoder().encode(text).buffer;
+  }
+
+  const modifiedResponse = new Response(body, response);
+  modifiedResponse.headers.set('Access-Control-Allow-Origin', '*');
+  return modifiedResponse; 
+
+}