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New Web Standard Lets Browsers Download Only Changed Code After Updates

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A new HTTP standard called Compression Dictionary Transport, formalized as RFC 9842 in September 2025, allows browsers to download only the changed portions of JavaScript bundles rather than entire files. The technology works by letting a browser inform the server which previously cached file it holds, enabling the server to send a compressed delta instead of the full response. Early adoption includes Chrome and Edge 130+, with Cloudflare launching a beta for the feature in April 2026. For versioned JavaScript assets, the approach can reduce re-download sizes from hundreds of kilobytes to just single-digit kilobytes after a minor code change. Developers can implement it at build time by precomputing deltas between release versions using existing Brotli or Zstandard command-line tools.

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