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Shared compression dictionaries #26257

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Summary

Shared Compression Dictionary is a new standard to allow much smaller resource sizes by reusing either previous resources as dictionaries, or having a separate disctionary.

It is available using Brotli or the newer ZStd compression standards and has been available in Chrome since 130

This PR adds the changes to HTTP headers to BCD.

Test results and supporting details

https://chromestatus.com/feature/5124977788977152

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@tunetheweb
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@pmeenan could you review this too?

@github-actions github-actions bot added data:http Compat data for HTTP features. https://developer.mozilla.org/docs/Web/HTTP size:l [PR only] 101-1000 LoC changed labels Mar 19, 2025
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pmeenan commented Mar 19, 2025

LGTM. The links will probably need to be updated once the RFC publishes (already approved, just waiting for the gears to turn).

@tunetheweb
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tunetheweb commented Mar 19, 2025

Linting issue should be fixed once w3c/browser-specs#1737 is merged and released

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Oh if there's a proper RFC then we should wait for that. Unless it's going to be a while? Do you know the RFC number yet?

@tunetheweb tunetheweb marked this pull request as draft March 19, 2025 15:16
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pmeenan commented Mar 19, 2025

Don't have a number yet but it may take a while because it is waiting for the shared brotli draft to get a RFC number first (also approved for publication). I'll see if I can nudge it but it's probably a few months out if history is any indicator

@github-actions github-actions bot added the data:html Compat data for HTML elements. https://developer.mozilla.org/docs/Web/HTML label Mar 19, 2025
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