How to add remix app to existing server at custom path?

[Nick-Minutello]

I want to add a remix app to an existing (koa) server.

To keep remix separated from existing functionality, I want the remix app to be at /my-custom-path

It seems I am 90% of the way there (and I really like how remix makes it possible to integrate with an existing server).
I am setting basename in remix plugin conf. I am setting base in vite conf. I am serving client at /my-custom-path using koa-mount. My app loads & runs at /my-custom-path - so far so good.

My problems are that the server handler middleware is running at the root - so it is now interfering with all other koa routes. If I mount the server handler at /my-custom-path it doesn’t work - as it no longer matches the routes. (It sees /doc/123 instead of /my-custom-path/doc/123 and that doesn’t match)

How can I have the server handler mounted at /my-custom-path or at least not interfering with existing koa routes?

Is there a config setting I am missing? Or is the koa adapter for remix missing something?

[Nick-Minutello]

To answer my own question: I managed to get this to work using koa-mount & a middleware hack.

koa-mount mounts the server handler at /my-custom-path/ - and my custom middleware just restores the url to the original url.
e.g.

ctx.request.url = ctx.request.originalUrl

That appears to work fine.