Skip to main content
Skip to search
Skip to select language
Technologies
Technologies Overview
HTML
CSS
JavaScript
Graphics
HTTP
APIs
Browser Extensions
MathML
References & Guides
Learn web development
Tutorials
References
Developer Guides
Accessibility
Game development
...more docs
Feedback
Send Feedback
Contribute to MDN
Report a content issue 🌐
Report a platform issue 🌐
Search MDN
MDN Web Docs Glossary: Definitions of Web-related terms
Simple response header
Change language
Simple response header
Old term for
CORS-safelisted response header
.