Fetch crashes in SSR

Describe the bug

I have /, a page that automatically fetches the endpoint /api/categories/2. This completely breaks SSR fetch. Error included in logs

Reproduction

1. Use @sveltejs/kit@next (1.0.0-next.131 and 1.0.0-next.133 tested)
2. Fetch an endpoint from a page from SSR
3. ‘Enjoy’?

Logs

TypeError [ERR_INVALID_URL]: Invalid URL
    at new NodeError (node:internal/errors:363:5)
    at onParseError (node:internal/url:536:9)
    at new URL (node:internal/url:612:5)
    at new Request (file:///mnt/dev/hamza/node_modules/@sveltejs/kit/dist/install-fetch.js:1239:16)
    at file:///mnt/dev/hamza/node_modules/@sveltejs/kit/dist/install-fetch.js:1448:19
    at new Promise (<anonymous>)
    at fetch (file:///mnt/dev/hamza/node_modules/@sveltejs/kit/dist/install-fetch.js:1446:9)

System Info

System:
    OS: Linux 5.10 Arch Linux
    CPU: (12) x64 AMD Ryzen 5 2600 Six-Core Processor
    Memory: 6.33 GB / 15.63 GB
    Container: Yes
    Shell: 3.2.2 - /bin/fish
  Binaries:
    Node: 16.3.0 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/bin/yarn
    npm: 7.15.1 - /usr/local/bin/npm
  Browsers:
    Brave Browser: 91.1.25.68
    Firefox: 88.0.1
  npmPackages:
    @sveltejs/kit: next => 1.0.0-next.133 
    svelte: ^3.34.0 => 3.38.3

Severity

can work around it, it’ll just be ugly

Additional Information

No response

[babeard]

I’ve been bitten in the past by not using kit’s built in fetch within the load function. Hopefully this solves your problem as well.

-   export async function load() {
+   export async function load({ fetch }) {

[manen]

Okay 😦