How to Check What HTTP Headers Your Browser Sends — And Why It Matters
DevToolKitEvery time your browser makes a request, it sends a set of HTTP headers that reveal a surprising amount about you. Here is what they contain and why you should care.
What Are HTTP Headers?
HTTP headers are metadata sent with every web request. They tell the server about your browser, language preferences, what content you can accept, and sometimes even where you came from.
The Most Revealing Headers
User-Agent: Contains your exact browser name, version, operating system, and device type. Example: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/122.0.0.0
Accept-Language: Reveals your language and regional preferences, narrowing down your location.
Referer: Shows the previous page you visited — telling the new site exactly where you came from.
Cookie: Contains session data that can track you across page loads.
See Your Headers
You can check what your browser is sending right now:
→ HTTP Headers Inspector (shows all headers with risk ratings)
How to Reduce Header Exposure
- Use Firefox with Enhanced Tracking Protection
- Install uBlock Origin
- Disable Referer headers in about:config
- Use a User-Agent switcher extension
- Clear cookies regularly