HTTP Header Explainer
Understand HTTP headers in plain English. Paste headers and get clear explanations.
Paste HTTP headers above to see explanations
Common Header Categories
Content
Content-Type, Content-Length
Content-Type, Content-Length
Caching
Cache-Control, ETag, Expires
Cache-Control, ETag, Expires
Security
CSP, HSTS, X-Frame-Options
CSP, HSTS, X-Frame-Options
CORS
Access-Control-*
Access-Control-*
Authentication
Authorization, WWW-Authenticate
Authorization, WWW-Authenticate
State
Cookie, Set-Cookie
Cookie, Set-Cookie
How to Use HTTP Header Explainer
- Paste your HTTP headers (from browser dev tools, curl, etc.)
- Each header is explained in plain English
- Security headers are highlighted
- See recommended values and best practices
About HTTP Header Explainer
Get plain English explanations for HTTP headers. Paste request or response headers and understand what each one does. Highlights security-relevant headers and suggests best practices.
Frequently Asked Questions
Where do I find HTTP headers?
In browser dev tools (Network tab), curl output with -v flag, or server logs.
What are the most important headers?
Content-Type, Cache-Control, Authorization, and security headers like Content-Security-Policy and CORS headers.
Are deprecated headers flagged?
Yes, deprecated or legacy headers are noted with modern alternatives suggested.