CORS issue (in combination with DigitalOcean Droplet)

[dekleijn.roy]

What is the name of the domain?

domain.com

What is the issue you’re encountering

Cors issue

What steps have you taken to resolve the issue?

I have an application on a DigitalOcean Droplet. It works fine.
It has a frontend on domain.com
An api on api.domain.com

Since I use Cloudflare I have CORS errors when the frontend (domain (dot) com) performs api-calls towards api.domain (dot) com.

I like to emphasise that this was not the case when I used DigitalOcean only.

Please suggest me a solution,
Roy

[dekleijn.roy]

Preflight Request URL:

https://api.domain.com/products?between=price,1,100&page=1

Request Method:

OPTIONS

Status Code:

301 Moved Permanently

Referrer Policy:

strict-origin-when-cross-origin

Actual Request:
https://api.domain.com/products?between=price,1,100&page=1
CORS error

[dekleijn.roy]

disabling the reverse proxy for api.domain.com worked… but I’m not sure if this is the best solution.