Allow server routes to defer back to the Nuxt renderer

[manniL]

Describe the feature

If you have the desire to write a server route which should only conditionally return values (think of accept header being set to application/json) and otherwise let Nuxt render the route, it isn't straightforward to do so.

Having a way to "defer back to the Nuxt renderer", ideally as "default" behavior when not returning a value or when calling a specific method would be helpful

Related:

• Nuxt Layer - Multi App - Disable Server Routes and Middleware for App #25885
• JSON response for dynamic page based on Accept header #27102

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.

[danielroe]

cc: @pi0

[pi0]

This is similar to server action support. If needed, I suggest registering a passthrough router in a middleware however I would strongly advise approaching it as an opt-in module (for use-cases really need overlapping routes) rather than built-in feature because of additional to middleware complexities it adds and one route acting differently.

[manniL]

Maybe that's something which should be documented then as recipe + pointing out when to use / when not use it?

[pi0]

Since this is a diverged usage/behavior (not a configured usage), I would suggest using a module that can both document and at least try to handle edge cases better.