request error Context conflict

[EduardoMateos]

Environment

production and dev

Reproduction

https://stackblitz.com/edit/nuxt-issue-20070

It is also related to the package "@nuxtjs/i18n" and "useCookie".

1. On a clean nuxt 3 project, install:
"@nuxtjs/i18n": "^8.0.0-beta.10"

2. Create global middleware like this:

export default defineNuxtRouteMiddleware(() => {
  const session = useCookie<string>("uuidSession");
});

3. Use siege and gtimeout to send multiple concurrent requests:
brew install siege
brew install coreutils
gtimeout 30 siege -c 5 http://localhost:3000

then sometimes I will get the error:
[nuxt] [request error] [unhandled] [500] Context conflict

Describe the bug

Error appears in production and local logs:
[nuxt] [request error] [unhandled] [500] Context conflict

Additional context

No response

Logs

[nuxt] [request error] [unhandled] [500] Context conflict                                                                                                             12:51:26
  at checkConflict (./node_modules/unctx/dist/index.mjs:6:13)  
  at Object.call (./node_modules/unctx/dist/index.mjs:31:7)  
  at contextCaller (./node_modules/nuxt/dist/app/nuxt.js:61:26)  
  at Hookable.callHookWith (./node_modules/hookable/dist/index.mjs:198:20)  
  at Hookable.nuxtApp.hooks.callHook (./node_modules/nuxt/dist/app/nuxt.js:64:63)  
  at ./.nuxt/dev/index.mjs:723:32  
  at processTicksAndRejections (node:internal/process/task_queues:96:5)  
  at async ./.nuxt/dev/index.mjs:394:22  
  at async Object.handler (./node_modules/h3/dist/index.mjs:1247:19)  
  at async Server.toNodeHandle (./node_modules/h3/dist/index.mjs:1322:7)

[c-schwan]

@kazupon can you please provide a workaround?

[hahatulk]

same! @kazupon please we need your help, it is blocking issue

[c-schwan]

@kazupon useCookie is not the issue, i tried without and the same error happened

[EduardoMateos]

I don't know how to further debug the problem. I hope someone can help. The problem is affecting us in production and we urgently need to solve it @kazupon

[hahatulk]

@kazupon useCookie is not the issue, i tried without and the same error happened

For me removing useCookie helps, but I need it

[kazupon]

Hi!
Thank you for your reporting!

I would like you to sepelate this issue if this issue can be reproduced with your cusomt module without using nuxt i18n first. 🙏
If so, you should report it to nuxt as an issue, as it is probably a problem with useCookie.

[c-schwan]

Hi! Thank you for your reporting!

I would like you to sepelate this issue if this issue can be reproduced with your cusomt module without using nuxt i18n first. 🙏 If so, you should report it to nuxt as an issue, as it is probably a problem with useCookie.

👍 thx @kazupon after digging deeper it stuck in the app:render hook. The unctx is checking the currentContext vs instance ctx and throws an 500 error. I dont think ist ein i18n issue

[c-schwan]

@EduardoMateos

can you please try below Nuxt 3.3.2?

See: nuxt/nuxt#19753

[EduardoMateos]

@c-schwan you're right. in version 3.3.0 it doesn't happen.

[elzodxon]

How can we resolve it?

[EduardoMateos]

fixed: nuxt/nuxt#20510

version 3.4.3