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-Site, Sec-Fetch-User |
| Last seen | 2025-12-05 07:47:23 |
| Link | https://w3c.github.io/webappsec-fetch-metadata/#sec-fetch-mode-header |
| Note | Indicates the request's mode. |
| Syntax | Sec-Fetch-Mode: <sh-token> |
Example header value:cors |
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