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🔧 API Tester

Simple HTTP Request Testing Tool

🌐 Request Configuration

📝 Cookie Management

This tool uses manual cookie management. You need to copy/paste cookies between requests. Response cookies will be displayed in the result for you to copy for subsequent requests.

Note: Proxy authentication is not supported in this version.

Executing request...

⚠️ Browser Testing Limitations

  • CORS: Cross-origin requests may be blocked. To fix: add https://demotest.io to your server's allowed origins, or use Access-Control-Allow-Origin: * for testing
  • Mixed Content: HTTPS sites cannot request HTTP URLs
  • Restricted Headers: Some headers are blocked by browsers (e.g., User-Agent, Origin)
  • Recommendation: Use "Test via Server" for most reliable results

🚀 Server Testing Limitations

  • Concurrent Requests: Limited to 2 simultaneous requests by default
  • Request Timeout: Maximum 30 seconds per request
  • Request Size: Body limited to 1MB maximum
  • Response Size: Response truncated if exceeds 2MB
  • Blocked Ports: Cannot access ports 22, 23, 25, 53, 80, 443, 993, 995
  • Private IPs: Cannot access localhost or private network ranges
  • Rate Limiting: Excessive requests may be temporarily blocked