SSR Data Revalidation / Refresh

[kyjus25]

Summary

Implement manual data refresh / revalidation, specifically in SSR mode

Background & Motivation

It is difficult (or impossible?) to re-fetch server side data without reloading the browser or re-routing to the same page. For instance, when a user's name is updated via a form on the page, the User object as a whole should be re-fetched from the server that was shared via middleware Astro.locals.

#228 is similar, but this is regarding the server fetched data and not static pages.

Goals

Provide function(s) to refresh data that was server rendered by referencing either:

• The fetch path you want to revalidate
• The tags that have been associated with the request
• The page route that is associated with the request

It is important to be able to reference the request indirectly, since the data may have been loaded from a layout or from the middleware (#469). I would also appreciate it to work in tandem with #532.

Examples / Inspiration

https://nuxt.com/docs/getting-started/data-fetching#refresh-and-execute
https://kit.svelte.dev/docs/load#rerunning-load-functions-manual-invalidation
https://nextjs.org/docs/app/building-your-application/data-fetching/revalidating#using-on-demand-revalidation

[lilnasy]

This is an important issue! Thanks for bringing it up.

[kyjus25]

Thanks for the comment, I'm glad you think so too! I think it's necessary for the complete SSR experience, and it follows close to Astro's "everything comes from the server, no JS" philosophy

[ryands17]

Is this possible right now?