🔓 CORS Workaround Guide - Rate Limit Checker

Solution 1: Browser Extension (Recommended - Easiest)

Install CORS extension to bypass CORS for utilbox.org

Chrome/Edge:

1. Install extension: "CORS Unblock" or "Allow CORS: Access-Control-Allow-Origin"
2. Enable extension
3. Add https://utilbox.org to whitelist (if option available)
4. Refresh page and test again

Popular Extensions:

• CORS Unblock
• Allow CORS: Access-Control-Allow-Origin

Firefox:

1. Install extension: "CORS Everywhere"
2. Enable extension
3. Refresh page

Solution 2: Chrome Flags (Development Only)

For development/testing only, DO NOT use for production browsing

Windows:

# Close Chrome completely first
# Open Chrome with flags:
chrome.exe --user-data-dir="C:/temp/chrome-dev" --disable-web-security --disable-features=IsolateOrigins,site-per-process

macOS:

# Close Chrome completely first
open -na Google\ Chrome --args --user-data-dir=/tmp/chrome-dev --disable-web-security --disable-features=IsolateOrigins,site-per-process

Linux:

google-chrome --user-data-dir=/tmp/chrome-dev --disable-web-security --disable-features=IsolateOrigins,site-per-process

Solution 3: Test APIs with CORS Enabled

Only test APIs that have CORS enabled

APIs that typically have CORS:

• ✅ Public APIs (JSONPlaceholder, httpbin.org)
• ✅ APIs with CORS headers: Access-Control-Allow-Origin: *
• ✅ Your own APIs (can configure CORS)

Test with httpbin.org:

URL: https://httpbin.org/status/429
Method: GET

This API has CORS enabled, perfect for testing rate limiting.

Solution 4: Local Proxy Server (Advanced)

Create a local proxy server to forward requests

Option A: Simple Node.js Proxy

// proxy-server.js
const express = require('express');
const { createProxyMiddleware } = require('http-proxy-middleware');
const cors = require('cors');

const app = express();
app.use(cors());

app.use('/api', createProxyMiddleware({
  target: 'https://api.example.com',
  changeOrigin: true,
  pathRewrite: { '^/api': '' },
}));

app.listen(3001, () => logger.log('Proxy running on http://localhost:3001'));

Usage:

• Test with: http://localhost:3001/api/endpoint
• Proxy will forward to https://api.example.com/endpoint

Option B: ngrok (Public Tunnel)

# Install ngrok
npm install -g ngrok

# Start local proxy
ngrok http 3001

# Use ngrok URL: https://abc123.ngrok.io/api/endpoint

Solution 5: Test Localhost APIs

Test APIs running on localhost (no CORS restrictions)

If you're developing a local API:

URL: http://localhost:3000/api/endpoint
Method: GET

Localhost requests are not blocked by CORS.