Simon Willison • 11/3/2025

The fetch()ening

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The article details the upcoming htmx 4 release, which replaces XMLHttpRequest with the fetch() API, necessitating a major version bump due to compatibility changes. It outlines the project's responsible upgrade plan, including perpetual support for htmx 2.0, compatibility extensions, and a multi-year rollout period for the new version.

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#JavaScript #Web Development #fetch api
The fetch()ening

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