Prefetch requests for Next.js SSG returning 412 status

Issues
,
1

Using Next.js SSG and prefetching, I am seeing that all of my prefetch requests fail with a 412. Using the XDN devtools, I can see the request and the route it was matched with:

Screen Shot 2020-11-09 at 1.42.48 PM
Screen Shot 2020-11-09 at 1.42.48 PM356×668 61.9 KB

My router is configured with edge caching as follows:

import { Router } from '@xdn/core/router';
import { nextRoutes } from '@xdn/next';
// import getPrerenderRequests from './xdn/getPrerenderRequests';

const SSR_CACHE_CONFIG = {
  browser: {
    maxAgeSeconds: 0,
  },
  edge: {
    maxAgeSeconds: 60 * 60 * 24,
    staleWhileRevalidateSeconds: 60 * 60 * 24,
  },
};

const API_CACHE_CONFIG = {
  browser: {
    maxAgeSeconds: 0,
    serviceWorkerSeconds: 60 * 60 * 24,
  },
  edge: {
    maxAgeSeconds: 60 * 60 * 24,
    staleWhileRevalidateSeconds: 60 * 60 * 24,
  },
};

export default new Router()
  // .prerender(getPrerenderRequests)
  .get('/category/:name', ({ cache }) => cache(SSR_CACHE_CONFIG))
  .get('/product/:id', ({ cache }) => cache(SSR_CACHE_CONFIG))
  .get('/_next/data/:build/category/:name.json', ({ cache }) =>
    cache(API_CACHE_CONFIG)
  )
  .get('/_next/data/:build/product/:id.json', ({ cache }) =>
    cache(API_CACHE_CONFIG)
  )
  .match('/service-worker.js', ({ serviceWorker }) => {
    return serviceWorker('.next/static/service-worker.js');
  })
  .use(nextRoutes); // automatically adds routes for all files under /pages

I did try to make the same request while removing the xdn_prefetch=1 param and see that I get a valid response. Is this something misconfigured in my router that would always reject these requests?

2

We are improving our support for SSG over the next few weeks. An update that’s coming soon will ensure that SSG pages get into the edge cache at deploy time.

3

This was not an issue with SSG (I was actually using SSR), but was failing to prerender my URLs so they were prefetch misses.