How to Use the HTTP Request Headers Inspector
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1
Open the tool — your browser's HTTP request headers are read automatically.
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2
View headers including User-Agent, Accept-Language, Accept-Encoding, and DNT.
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3
Copy any header value with one click.
Practical Example & Use Case
Common Real-World Scenario
Verifying that your browser sends the correct Accept-Language header for internationalization debugging.
Technical Notes & Limitations
Browser Engine Architecture
Only client-side headers visible to JavaScript are shown. Server-received headers (e.g. raw TCP headers) require server-side inspection.
Frequently Asked Questions
Can I see my cookies here?
Only non-HttpOnly cookies are visible to JavaScript. HttpOnly cookies (the most secure type) are intentionally hidden from JS.
Why does User-Agent matter?
Websites use the User-Agent string to detect your browser and OS version for compatibility and analytics. A spoofed or unusual User-Agent can cause issues.