getRequestURL in a server plugin, middleware, etc. does not consistently return the actual origin or hostname of the deployed site/worker

[adamdehaven]

Environment

• Nitro 2.9.6
• Nuxt 3.11.2

Reproduction

Description	URL
Deploy preview	https://nitro_origin_repro.adamdehaven.workers.dev/
CodeSandbox	https://codesandbox.io/p/github/adamdehaven/nitro-origin-repro/main
Code	https://github.com/adamdehaven/nitro-origin-repro

Describe the bug

When utilizing getRequestURL(event) inside Nitro middleware (or inside a Nitro plugin, etc.) in a Nuxt project, I would expect the origin and hostname to return the deployed hostname and origin of the request rather than an "internal" server origin/host or something hidden behind a CNAME.

Additional context

I utilized a Nuxt app as a reproduction. You should be able to see where I am attempting to retrieve and store the origin and hostname via getRequestURL in /server/middleware/set-origin.ts

I'm fully aware I could be missing something obvious or intended, so if this is the case, I'd greatly appreciate some help in understanding what's going on and what is to be expected based on the code in the reproduction.

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Problem I'm trying to solve (simplified):

I have a Nuxt application that will be serving a multi-tenant application whereby the Nuxt layers provide all functionality, and content is loaded at runtime per tenant.

We will be utilizing dynamic subdomains to determine which tenant's app is being requested, so I'd expect to be able to utilize any request event to identify app1.example.com or app2.example.com based on the origin or hostname extracted via getRequestURL(event).

Logs

No response