🐛 BUG: SvelteKit Still Had Null Body Response Error

What version of Wrangler are you using?

0.0.15

What operating system are you using?

Windows

Describe the Bug

SvelteKit still gets null body response error which was fixed in https://github.com/cloudflare/miniflare/releases/tag/v2.0.0-rc.3, not sure how Wrangler2 incorporates miniflare, is there a pending version update or is this a separate issue?

SETUP

npm init svelte@next my-app
npm i --save-dev @sveltejs/adapter-cloudflare@next
Update svelte.config.js to use adapter.
npm install

LAUNCH npx wrangler pages dev --proxy 3000 -- npx svelte-kit dev --host ERROR When viewing project on _http://localhost:8788/_ page will alternate between rendering correctly and showing this:

BEHAVIOR When viewing same page with network tab open and disable cache enabled, error does not occur

Output:

[pages:err] GET /: TypeError: Response with null body status cannot have body
    at new Response (E:\Programming\Projects\ArtPageSvelteWrangler\node_modules\undici\lib\fetch\response.js:160:15)
    at new Response (E:\Programming\Projects\ArtPageSvelteWrangler\node_modules\@miniflare\core\src\standards\http.ts:556:13)
    at Object.construct (E:\Programming\Projects\ArtPageSvelteWrangler\node_modules\@miniflare\core\src\plugins\core.ts:69:29)
    at Object.fetch (<script>:5:24)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at EventTarget.[kDispatchFetch] (E:\Programming\Projects\ArtPageSvelteWrangler\node_modules\@miniflare\core\src\standards\event.ts:359:13)
    at Server.<anonymous> (E:\Programming\Projects\ArtPageSvelteWrangler\node_modules\@miniflare\http-server\src\index.ts:167:20)
GET / 500 Internal Server Error (22.61ms)

[petebacondarwin]

We’ve found the issue. The problem is in the Miniflare proxy. @GregBrimble is working on a fix. In the meantime, you can (sort of) workaround this by building the Svelte app and then running the build output via pages directly…

npm run build
npx wrangler pages dev .svelte-kit/cloudflare

[petebacondarwin]

Fix here: https://github.com/cloudflare/miniflare/pull/172