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Showing content from http://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Use-As-Dictionary below:

Use-As-Dictionary header - HTTP | MDN

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Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The HTTP Use-As-Dictionary response header lists the matching criteria that the Compression Dictionary Transport dictionary can be used for, for future requests.

See the Compression Dictionary Transport guide for more information.

Use-As-Dictionary: match="<url-pattern>"
Use-As-Dictionary: match-dest=("<destination1>" "<destination2>", …)
Use-As-Dictionary: id="<string-identifier>"
Use-As-Dictionary: type="raw"

// Multiple, in any order
Content-Encoding: match="<url-pattern>", match-dest=("<destination1>")

match

A string value containing a URL Pattern: only resources whose URLs match this pattern may use this resource as a dictionary. Regular expression capturing groups are not allowed, so URLPattern.hasRegExpGroups must be false.

match-dest

A space-separated list of strings, with each string in quotes and the whole value enclosed in parentheses, that provides a list of Fetch request destinations that requests must match if they are to use this dictionary.

id

A string value that specifies a server identifier for the dictionary. This ID value will then be added in the Dictionary-ID request header when the browser requests a resource which can use this dictionary.

type

A string value that describes the file format of the supplied dictionary. Currently only raw is supported (which is the default) so this is more for future compatibility.

Use-As-Dictionary: match="/product/*"

This says the dictionary is only to be used for URLs starting with /product/.

Use-As-Dictionary: match="/app/*/main.js"

This uses a wildcard to match multiple versions of a file.

Use-As-Dictionary: match="/product/*", match-dest=("document")

This uses match-dest to ensure the dictionary is only used for document requests so <script src="/product/js/app.js"> resource requests for example would not match.

Use-As-Dictionary: match="/product/*", match-dest=("document" "frame")

This would allow the dictionary to match both top-level documents and iframes.

Use-As-Dictionary: match="/product/*", id="dictionary-12345"

When Use-As-Dictionary includes an id directive, as in this example, the id value will be included in the Dictionary-ID request header for resources that can use this dictionary. The resource request will also include the SHA-256 hash of the dictionary surrounded by colons in the Available-Dictionary header:

Accept-Encoding: gzip, br, zstd, dcb, dcz
Available-Dictionary: :pZGm1Av0IEBKARczz7exkNYsZb8LzaMrV7J32a2fFG4=:
Dictionary-ID: "dictionary-12345"

The server must still check the hash from the Available-Dictionary header — the Dictionary-ID is additional information for the server to identify the dictionary but does not replace the need for the Available-Dictionary header.

Use-As-Dictionary: match="/product/*", type="raw"

Currently, only raw is supported (which is the default) so this is more for future compatibility.

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