Bug with Setting headers chapter in SvelteKit tutorial

[anrunt]

https://github.com/sveltejs/learn.svelte.dev/tree/main/content/tutorial/03-sveltekit/04-headers-and-cookies/01-headers

During writing code for setHeaders, my browser started downloading 20 files with random numbers and letters when i reached this moment in the editor:
"export function load({ setHeaders }) {
setHeaders({
'Content-Type':"
})
}