How to make a background request to enable stale-while-revalidate from Hono middleware?

[tazsingh]

Hey there,

I created this repo: https://github.com/guild-host/hono-swr-cache

It's my attempt to provide stale-while-revalidate within Hono middleware that's drop-in compatible with the existing (lovely!) cache middleware.

Unfortunately, I cannot figure out if it's possible to serve a cached response while also revalidating next within middleware. As far as I can tell, this is not possible with the existing design, but I could be missing something?

My repository has a full test suite for my progress thus far. There is 1 failing test that describes the behaviour that I'm struggling to achieve. I've also updated the README with more information on the project in general.

My general belief is that if next accepts Context, I should be able to achieve what I'm seeking? Then I can essentially compose a new Context, pass that into next, and then operate on that Context within my middleware function. Something like:

const revalidatingContext = new HonoRequestContext(existingRequestContext)

// this parameter can be optional,
// and defaulting to the `existingRequestContext` if not provided
await next(revalidatingContext)

revalidatingContext.res // this is the mutated Response that I can work with

However I'm hesitant to explore such a solution if there are other ways of achieving what I'm looking for or other plans in place that would unlock this for me!

Let me know if there's a path forward here 🙏

Thank you for the awesome library! ❤️