Is there a way to preserve ?_rsc query params on redirection with ISR on app router? (because Missing ?_rsc params cause CDN issue)

[zecka]

I use redirection in some pages with import { permanentRedirect } from 'next/navigation';

Once the website is build redirection work well but cause issue with CDN caching because of missing ?_rsc query params. (In my case CDN is Azure front door)

For example i have following redirection

website.com/news/my-article-old-url --> website.com/news/my-article-new-url

On prefetch or on router page change nextjs execute following request website.com/news/my-article-old-url?_rsc=hash with a header request Rsc=1.

This request is redirect from website.com/news/my-article-old-url?_rsc=hash to website.com/news/my-article-new-url and then CDN cache the rsc result as page result, so if we reload the page website.com/news/my-article-new-url we got json like response instead of html.

I already try to intercept request with header Rsc=1 and without queryParams ?_rsc on middleware to add response header Cache-Control: no-cache. But _rsc query params and rsc header is always null on middleware...

[magnnus]

I had encounted the same issue. But i only use the step1.

Step 1. remove all internal redirect ( triggered by user click)

Below you can have a try.

Step2. delete loading.js (DO NOT use streaming render - always 200 http status code)
Step3. have a custom server ( nginx)
Step4. rewrite response cache-control(no-cache) in nginx if the proxied server(next.js) has a 3xx status code AND request header has a rsc field

[magnnus]

if the request has a rsc request header field AND the request url has no args ?rsc=... , then set Cache-Control: private, max-age=0, no-cache, no-store, must-revalidate in Nginx.

e.g: Nginx njs snippets

if (r.headersIn.rsc && !r.variables.arg_rsc) {
    r.headersOut['Cache-Control'] = `private, max-age=0, no-cache, no-store, must-revalidate`;
 }

Although it can solve the problem, we still hope that the official can provide a more concise solution

[magnnus]

if CDN supports cache key (Vary), It should be no problem

[magnusriga]

@zecka Did you figure out how to spot the request in middleware? In our case, we have redirect in middleware, but see a lot of errors on rsc requests failing after redirect, presumably because redirect drops the search params.

Thanks a lot for any advice!