Support SWR

[MarijnFK]

When using a SWR option in routeRUles, the nonce-header does not match the one served from the server:

Version

nuxt-security: 1.3.2 nuxt: 3.11.x

Steps to reproduce

enable swr on all routes:

routeRules: {
    "*": {
      swr: process.env.NODE_ENV === "development" ? false : parseInt(process.env.SWR_TTL ? process.env.SWR_TTL.toString() : "60"),
    },
  },

What is Expected?

The header should use the generated nonce value

What is actually happening?

The header uses the new nonce, but the html served is using the nonce that was used when generating the page

[vejja]

You're right and I think the conclusion is that we do not support SWR.

I struggle to see how SWR is compatible with nonce. Nonce is supposed to be generated just once and be unguessable. If we re-use nonces, this breaks the RFC. So we have 2 solutions:

• Either we regenerate the nonce and re-inject the new nonce in the HTML. Which means that we effectively break SWR.
• Or we fallback to hash mode, as if the page was pre-rendered with SSG. Seems better probably

@Baroshem what's your opinion on this ?

[Baroshem]

Thanks for the investigation @vejja

I would probably go for the second option but maybe @danielroe would have a better idea? :)

[vejja]

Let me investigate better because I actually think we can support natively without moving to hash mode

Update: I think the new feat/unified-router-context branch will support SWR natively, will confirm later

[vejja]

@MarijnFK would you be able to share a minimal Stackblitz repro of a basic use case ? I'd like to check that we can indeed support SWR on a relevant setup

[MarijnFK]

@vejja I've made a very simple stackblitz, it's not really a use-case but it shows the problem. stackblitz

The top date shows the ssr-date. It should update every 10 seconds. The bottom date should be hydrated, but doesn't because the script is blocked from executing

[Baroshem]

@vejja have you maybe checked if this new solution of yours works with the stackblitz repro providede by @MarijnFK ?

[vejja]

@vejja have you maybe checked if this new solution of yours works with the stackblitz repro providede by @MarijnFK ?

Yes, I included an equivalent example in the playground under the /swr page there, it is testable with yarn dev and then going to localhost:3000/swr

[MarijnFK]

@vejja Good to hear, looking forward to the update! Thanks for the (quick!) responses