User-Agent Tester

Why Test User-Agents?

Web servers often examine the User-Agent HTTP header to determine the type of device, browser, or bot that is requesting a page. Based on this information, the server might decide to:

• Redirect: Send mobile users to a mobile-specific subdomain (like `m.example.com`).
• Serve Different Content (Cloaking): Sometimes, websites accidentally or intentionally serve different content to Googlebot than to regular users. This is called cloaking and can result in SEO penalties.
• Block Access: Firewalls and CDNs often block known malicious bots, or sometimes aggressively block legitimate scrapers or missing User-Agents.

How it works

This tool sends an HTTP GET request to the specified URL with the exact User-Agent string you provide. It automatically follows any redirects, allowing you to see the final destination URL and the headers returned by the server.