On: https://learn.svelte.dev/tutorial/headers

When you're typing out the code in the instructions, once you get to 'text/plain' the browser will start spamming downloads of the contents in the iFrame (i.e. if you have "this is a bug" it will download a file with that text in it).

I couldn't replicate this in Chrome

Replication:

copy and paste this into src/routes/+page.server.js

export function load({setHeaders}) {
// set headers
setHeaders({
'Content-Type': 'text'
})
}

In my browser, the page begins reloading constantly at this point.
If you add a '/' at the end of 'text' it will start downloading constantly.

I've noticed that if I paste the entire solution, or preempt the setHeaders({...}) part with a return after it, the issue doesn't happen.