Broken init packages for --https."Invalid request body" for any settings

[ambrt]

Describe the bug

Fresh skeleton and demo app are failing when --https is set for dev server.
There is only "Invalid request body" as a response in browser and no errors in terminal.

Happens in both Chrome and Firefox on Ubuntu 20

Reproduction

locally:
npm init svelte@next new-svelte-app
npm run dev -- --https

Stackblitz has error when running dev with --https but its probably related to issuing cert and not sveltekit

l is not a function
TypeError: l is not a function (...)

Logs

No logs are in terminal.
Browser error is just
"The character encoding of the plain text document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the file needs to be declared in the transfer protocol or file needs to use a byte order mark as an encoding signature."

System Info

System:
    OS: Linux 5.4 Ubuntu 20.04.3 LTS (Focal Fossa)
    CPU: (2) x64 Intel(R) Core(TM)2 Duo CPU     E8400  @ 3.00GHz
    Memory: 167.40 MB / 7.77 GB
    Container: Yes
    Shell: 5.0.17 - /bin/bash
  Binaries:
    Node: 16.2.0 - ~/.nvm/versions/node/v16.2.0/bin/node
    Yarn: 1.22.17 - /usr/local/bin/yarn
    npm: 8.3.2 - ~/.nvm/versions/node/v16.2.0/bin/npm
    Watchman: 20201115.021953.0 - /usr/local/bin/watchman
  Browsers:
    Chrome: 91.0.4472.164
    Firefox: 96.0
  npmPackages:
    @sveltejs/adapter-auto: next => 1.0.0-next.14 
    @sveltejs/kit: next => 1.0.0-next.240 
    svelte: ^3.44.0 => 3.46.2

Severity

blocking all usage of SvelteKit

Additional Information

No response

[ambrt]

It was introduced in @1.0.0-next.234 although with different error.

TypeError [ERR_INVALID_HTTP_TOKEN]: Header name must be a valid HTTP token [":method"]
    at file:///home/user/Desktop/Dev/new-svelte-3/node_modules/@sveltejs/kit/dist/install-fetch.js:5207:6
    at Array.map (<anonymous>)
    at new Headers (file:///home/user/Desktop/Dev/new-svelte-3/node_modules/@sveltejs/kit/dist/install-fetch.js:5206:12)
    at new Request (file:///home/user/Desktop/Dev/new-svelte-3/node_modules/@sveltejs/kit/dist/install-fetch.js:5934:19)
    at file:///home/user/Desktop/Dev/new-svelte-3/node_modules/@sveltejs/kit/dist/chunks/index.js:1979:8

[Conduitry]

This sounds like the same as #3479.

[benmccann]

Closing as duplicate