### What?
When running a
[multi-zone](https://github.com/vercel/next.js/tree/canary/examples/with-zones)
app in dev, guest app pages would infinitely reload if you change the
basePath of the host app to the default one (omit basePath settings in
next.config.js) (empty string `""` as per Next.js docs).
### Why?
The HMR upgrade request would fail and get caught into a retry loop. In
the multi-zone case, they fail because the upgrade request would be sent
again for a request that had already been upgraded. This resulted in a
"server.handleUpgrade() was called more than once with the same socket"
error, causing the upgrade request to fail.
Every time a retry occurred, the page would trigger a full refresh since
certain HMR errors cause the browser to reload.
### How?
This ensures the upgrade handler only responds to requests that match
the configured basePath (considering when there is no basePath). Default
basePath for Next.js applications it's an empty string `""`.
Ref: https://nextjs.org/docs/app/api-reference/next-config-js/basePath
Other fixes & updates related to the bug:
- Updated test apps to avoid having issues regarding client & server
mismatch for dates
- Added default use case in e2e tests, where you have a default Next.js
application where the basePath it's the default one and a guest app that
it's being routed by the main one through Next.js rewrites.
Closes NEXT-1797
Fixes#59161Fixes#56615Fixes#54454
---------
Co-authored-by: Zack Tanner <zacktanner@gmail.com>
### What?
When running a
[multi-zone](https://github.com/vercel/next.js/tree/canary/examples/with-zones)
app in dev, app pages would infinitely reload
### Why?
The HMR upgrade request would fail and get caught into a retry loop. In
the multi-zone case, they fail because the upgrade request would be sent
again for a request that had already been upgraded. This resulted in a
"server.handleUpgrade() was called more than once with the same socket"
error, causing the upgrade request to fail.
Every time a retry occurred, the page would trigger a full refresh since
certain HMR errors cause the browser to reload.
### How?
This ensures the upgrade handler only responds to requests that match
the configured basePath.
Closes NEXT-1797
Fixes#59161Fixes#56615Fixes#54454
Hendrik Liebau