Cypress can't load assets from Vite's devserver

Question

I have an app running at http://localhost/ which loads it's assets from a Vite's devserver which is up at http://localhost:3000/. Cypress is hitting the main app correctly, but it doesn't load the assets, leaving me with a blank page because the page received no response for the http://localhost:3000/app.js file.

Everything works fine if I visit the app directly on the browser. The browser is able to load the assets from port 3000 without problems. They're only failing when requested via the Cypress test runner.

I tried to cy.visit('http://localhost:3000/') and it seems like the Vite's devserver is refusing connections. But I checked the Vite documentation to see if there was something that could be blocking this and nothing caught my eyes. Also, the strange part is that they're only blocked when requested via the test runner.

I'm running Cypress on WSL2 and my app and the Vite devserver are running through Docker mapping to the addresses above. Is there any additional configuration I'm missing?

If I build the assets and serve them from the main app address (http://localhost/dist/app.js), everything works fine and my tests run fine. So, I'm guessing there's some sort of configuration I need to do to allow Cypress to request assets form other hosts?