HTTP Header Checker — Free Header Inspector
Inspect HTTP response headers of any URL. View, parse, and understand headers with explanations for each one.
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How It Works
Enter a URL or paste raw HTTP response headers. The tool displays each header with its value and a brief explanation of what it does. Headers are grouped by category (General, Cache, Security, CORS).
Frequently Asked Questions
When checking a URL from the browser, only CORS-safelisted headers are visible. For complete header inspection, use the 'Paste Headers' mode.
The tool provides descriptions for common headers including Content-Type, Cache-Control, Content-Length, Server, ETag, Last-Modified, and CORS headers.