Fetch metadata request header - MDN Web Docs Glossary: Definitions of Web-related terms 编辑

A fetch metadata request header is a HTTP request header that provides additional information about the context the request originated from. These header names are prefixed with Sec- and thus they are forbidden header names so headers can not be modified from JavaScript.

Fetch metadata request headers provide the server with additional information about where the request originated from, enabling it to ignore potentially malicious requests.

The following are fetch metadata request headers:

• Sec-Fetch-Site
• Sec-Fetch-Mode
• Sec-Fetch-User
• Sec-Fetch-Dest