Fetch Metadata Destination header

Category: Security
Type: New or changed feature
Status: Enabled by default (Chrome 80)
Intent stage: Prepare to ship

Summary

The `Sec-Fetch-Dest` HTTP request header exposes information about a request's `destination` to servers, which allows them to make better-informed decisions about the implications of serving a given response. https://w3c.github.io/webappsec-fetch-metadata/#intro lays out the motivation.

Standards & signals

Specification: https://w3c.github.io/webappsec-fetch-metadata/#sec-fetch-dest-header
Firefox: No signal
Safari: No signal
Web developers: Positive
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=843478

Explainers: https://github.com/w3c/webappsec-fetch-metadata/

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