fix: run onBeforeResponse middleware in declared order#2204
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h3 v2 middleware compose onion-style, so logic after `await next()` unwinds innermost-first (reverse registration order). The onBeforeResponse wrappers do their work after awaiting next(), which made them execute backwards relative to the array the user passed to createMiddleware. Register the wrappers reversed so the callbacks run in their declared order, matching v1 behavior. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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brenelz
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Jul 17, 2026
| // h3 middleware compose onion-style: logic after `await next()` unwinds | ||
| // innermost-first (reverse registration order). Register the wrappers | ||
| // reversed so onBeforeResponse functions run in their declared order. | ||
| mw.push(...args.onBeforeResponse.map(wrapResponseMiddleware).reverse()); |
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@katywings you probably know the most about middleware. Does this change make sense?
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Fixes #2131
What is the current behavior?
onBeforeResponsefunctions passed tocreateMiddlewareexecute in reverse array order. h3 v2 middleware compose onion-style, so logic afterawait next()unwinds innermost-first — andwrapResponseMiddlewaredoes its work after awaitingnext(), as noted by @sabercoy in the issue.What is the new behavior?
The response wrappers are registered reversed, so the
onBeforeResponsecallbacks run in the order they were declared, matching v1 semantics.onRequestordering is unchanged.Other information
Added
packages/start/src/middleware/index.spec.tscovering onRequest order, onBeforeResponse order (fails without this fix), request→handler→response sequencing, and response replacement from an onBeforeResponse middleware.🤖 Generated with Claude Code