Multiple Nuxt Chunk Files Returning 503 Errors (Service Unavailable)

[muhsin-life]

Environment

• Operating System: Windows_NT
• Node Version: v20.19.5
• Nuxt Version: 3.17.4
• CLI Version: 3.29.0
• Nitro Version: 2.12.6
• Package Manager: bun@1.1.29
• Builder: -
• User Config: devtools, experimental, modules, pinia, fonts, app, shadcn, i18n, runtimeConfig, robots, sitemap, routeRules, compatibilityDate
• Runtime Modules: @pinia/nuxt@0.5.5, @pinia-plugin-persistedstate/nuxt@1.2.1, @nuxtjs/tailwindcss@6.14.0, shadcn-nuxt@0.10.4, @nuxtjs/i18n@9.5.5, @nuxt/image@1.10.0, @vueuse/nuxt@10.11.1, @nuxt/eslint@1.4.1, @vue-final-modal/nuxt@1.0.3, maz-ui/nuxt@3.44.3, @nuxtjs/robots@5.5.5, @nuxtjs/device@3.2.4, @nuxtjs/sitemap@7.4.7, @nuxt/fonts@0.11.3, nuxt-schema-org@5.0.9, nuxt-seo-utils@7.0.17
• Build Modules: -

Reproduction

The issue seems to occur sporadically and is not consistently reproducible.

Describe the bug

Occasionally receiving a 503 Service Unavailable (from disk cache) error when loading Nuxt scripts in production.

Observed Behavior:

• Some Nuxt JS chunks (e.g., /_nuxt/xxx.js) fail to load with a 503 response.
• The response header indicates it may be served from Cloudflare’s disk cache.
• Refreshing or clearing cache usually resolves it.

Expected Behavior:

• Scripts should load reliably without 503 errors.

Additional context

Additional Notes:

• Seems related to Cloudflare edge cache inconsistencies.

Logs

[github-actions]

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[tayler-king]

Also experiencing this, starting within the last week or so.

Found another relevant report of it: https://www.reddit.com/r/Nuxt/comments/1nykzvu/integrity_attribute_mismatch_503_errors_on_nuxt/

Which placement option are you using for your Cloudflare workers? Curious if the placement would have any effect on this.

[danielroe]

this should probably be raised at https://github.com/nuxt/scripts/issues

[harlan-zw]

Possibly related to #29624?

I don't think its a script module issue as he doesn't have it installed 😛 (counter to the issue title)

[danielroe]

ahh. can you reproduce this locally or only on cloudflare?

[muhsin-life]

error pattern 

GET https://example.com/_nuxt/D0a2mP_H.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/hDftUSJl.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/CHnfHVCO.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/BcEoY06U.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/Nw57NgvM.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/Cxhse9rO.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/BhKzuhQT.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/KGiW206s.js net::ERR_ABORTED 503 (Service Unavailable) 
GET https://example.com/_nuxt/Dla6KyXu.js net::ERR_ABORTED 503 (Service Unavailable)

The integrity mismatch combined with 503 errors suggests either a caching/CDN issue or an asset generation problem during build.

Has anyone encountered this combination of errors before?
Could this be related to Cloudflare’s caching interfering with Nuxt’s asset integrity checks?

Any guidance or insights would be appreciated! 🙏

[danielroe]

this absolutely sounds like something to raise with cf

nuxt doesn't handle serving static assets if you're using cf pages or workers

[github-actions]

Would you be able to provide a minimal reproduction? 🙏

More info

Why do I need to provide a reproduction?

Reproductions make it possible for us to triage and fix issues quickly with a relatively small team. It helps us discover the source of the problem, and also can reveal assumptions you or we might be making.

What will happen?

If you've provided a reproduction, we'll remove the label and try to reproduce the issue. If we can, we'll mark it as a bug and prioritize it based on its severity and how many people we think it might affect.

If needs reproduction labeled issues don't receive any substantial activity (e.g., new comments featuring a reproduction link), we'll close them. That's not because we don't care! At any point, feel free to comment with a reproduction and we'll reopen it.

How can I create a reproduction?

Please use a template below to create a minimal reproduction

A public GitHub repository is also perfect. 👌

Please ensure that the reproduction is as minimal as possible. See more details in our guide.

You might also find these other articles interesting and/or helpful:

• The Importance of Reproductions
• How to Generate a Minimal, Complete, and Verifiable Example

[johnm1998]

disabling cloudflare smart brain fixed this for me