Firefox Tomorrow

http header

Available-Dictionary header

View on MDN ↗

Limited availability

The HTTP Available-Dictionary request header allows the browser to specify the best matching dictionary it has to allow the server to use Compression Dictionary Transport for a resource request.

Clients can send an Available-Dictionary header when they support dcb or dcz encodings. The header is a colon-surrounded base-64 encoded SHA-256 hash of the dictionary contents.

See the Compression Dictionary Transport guide for more information.

Syntax

Available-Dictionary: :<base64-hash>:

Directives

  • <base64-hash>
    • : A base-64 encoded SHA-256 hash of the dictionary contents.

Examples

Accept-Encoding: gzip, br, zstd, dcb, dcz
Available-Dictionary: :pZGm1Av0IEBKARczz7exkNYsZb8LzaMrV7J32a2fFG4=:

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also