Bug: Redirect is not allowed for a preflight request.

[BrianLYS]

Description

Having issues with hosting the litestar application with a separate frontend.

Running pnpm run dev with litestar run -r works just fine.

Problem is getting this to production level infrastructure.

In my repository that I've linked, I place a caddy server infront of it and I end up receiving this error.

Access to fetch at 'http://localhost/accounts/login' from origin 'http://localhost:5173' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.

URL to code causing the issue

https://github.com/BrianLYS/sveltekit-litestar-cors-error

MCVE

Access to fetch at 'http://localhost/accounts/login' from origin 'http://localhost:5173' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.

Steps to reproduce

1. Start Caddy, Backend and Postgresql Server with `docker compose up` in root dir 
2. Start frontend server, `cd frontend/app`, `cp .env.example .env`, `pnpm install`, `pnpm run dev`
3. Open localhost:5173 in browser
4. Click register, fill in form.
5. Login with credentials.
6. Inspect console to see error log.

Screenshots

"![SCREENSHOT_DESCRIPTION](SCREENSHOT_LINK.png)"

Logs

No response

Litestar Version

2.8.3

Platform

• [X] Linux
• [X] Mac
• [ ] Windows
• [ ] Other (Please specify in the description above)

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[peterschutt]

Are you interested in submitting a PR @BrianLYS?

[BrianLYS]

@peterschutt a PR to include options method for litestar to pass redirects? I tried to write a custom middleware previously to allow options but I couldn't solve it.

Seems this was brought up before too. https://github.com/orgs/litestar-org/discussions/602