A request headers is an HTTP header that the client sends to the server.
HTTP request headers list | Browser Headers Viewer
| Type | Non-standard |
| Subype | Fetch metadata |
| Related headers | Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site |
| Last seen | 2025-12-05 07:32:28 |
| Link | https://w3c.github.io/webappsec-fetch-metadata/#sec-fetch-user-header |
| Note | Only sent for requests initiated by user activation, and its value will always be ?1. |
| Syntax | Sec-Fetch-User: <sh-boolean> |
Example header value:?1 |
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