harttle/auto-cors

A proxy to automatically add CORS headers

auto-cors

A proxy to automatically add CORS headers, supports:

• Simple requests with Access-Control-Allow-Origin: "*"
• OPTIONS preflight request for non-simple requests.
• CORS request with crendentials included.

There's an auto-cors service deployed at cors.harttle.com. Both HTTP and HTTPS are supported:

• http://cors.harttle.com/https://example.com
• https://cors.harttle.com/https://example.com

Additional headers:

• Auto-Cors-Request-Header to set additional request headers that are not allowed (like cookie, referer, origin, etc.) in headers. e.g.

  // set a "Cookie: XXX" header when forwarding request
  fetch(
      "https://cors.harttle.com/https://example.com",
      {
          headers: {
              "Auto-Cors-Request-Header-Cookie": "XXX"
          }
      }
  )

Install

npm i auto-cors

Use in Node.js

const cors = require("auto-cors")
const port = process.env.PORT || 8080;
cors.server.listen(port, () => {
    console.log(`server listening to ${port}`);
});

Visit http://localhost:8080/https://example.com in your browser.

Use in command line

npx auto-cors

The default port is 8080, use AUTO_CORS_PORT to set a different port, for example:

AUTO_CORS_PORT=9001 npx auto-cors

Visit http://localhost:9001/https://example.com in your browser.

Deploy your own service

Install

# install globally
npm i -g auto-cors
auto-cors
# or use npx auto-cors

Here's a systemd script for auto-cors:

https://gist.github.com/harttle/a801084f42b9ee1a2aa6bf5c191b9ad9