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docs(engine): clarify Use() registration order#4614

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Gav1nnn wants to merge 1 commit intogin-gonic:masterfrom
Gav1nnn:docs-engine-use-order
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docs(engine): clarify Use() registration order#4614
Gav1nnn wants to merge 1 commit intogin-gonic:masterfrom
Gav1nnn:docs-engine-use-order

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@Gav1nnn
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@Gav1nnn Gav1nnn commented Apr 4, 2026

Summary

  • clarify that Engine.Use() applies to routes registered after the call
  • document that 404 and 405 handler chains are rebuilt from the current
    global middleware set
  • add a regression test covering routes registered before and after Use()

This documents the current behavior without changing routing semantics.

Fixes #2010.

Testing

  • go test ./...
  • go test -race ./...

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codecov bot commented Apr 4, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (3dc1cd6) to head (700d441).
⚠️ Report is 275 commits behind head on master.

Additional details and impacted files
@@            Coverage Diff             @@
##           master    #4614      +/-   ##
==========================================
- Coverage   99.21%   98.37%   -0.84%     
==========================================
  Files          42       48       +6     
  Lines        3182     3138      -44     
==========================================
- Hits         3157     3087      -70     
- Misses         17       42      +25     
- Partials        8        9       +1     
Flag Coverage Δ
?
--ldflags="-checklinkname=0" -tags sonic 98.36% <ø> (?)
-tags go_json 98.29% <ø> (?)
-tags nomsgpack 98.35% <ø> (?)
go-1.18 ?
go-1.19 ?
go-1.20 ?
go-1.21 ?
go-1.25 98.37% <ø> (?)
go-1.26 98.37% <ø> (?)
macos-latest 98.37% <ø> (-0.84%) ⬇️
ubuntu-latest 98.37% <ø> (-0.84%) ⬇️

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Successfully merging this pull request may close these issues.

Middleware Use behavior undocumented and unintuitive

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