For security reasons regarding CORS, your hosted instance of Materialious must serve as the value for the Access-Control-Allow-Origin header on Invidious.

Invidious doesn't provide a simple way to modify CORS, so this must be done with your reverse proxy.

Caddy example

invidious.example.com {
	@cors_preflight {
		method OPTIONS
	}
	respond @cors_preflight 204

	header Access-Control-Allow-Credentials true
        header Access-Control-Allow-Origin "https://materialious.example.com" {
		defer
	}
        header Access-Control-Allow-Methods "GET,POST,OPTIONS,HEAD,PATCH,PUT,DELETE"
        header Access-Control-Allow-Headers "User-Agent,Authorization,Content-Type"

	reverse_proxy localhost:3000
}

materialious.example.com {
	reverse_proxy localhost:5173
}

Nginx example

server {
    listen 80;
    server_name invidious.example.com;

    location / {
        if ($request_method = OPTIONS) {
            return 204;
        }

        add_header Access-Control-Allow-Credentials true;
        add_header Access-Control-Allow-Origin "https://materialious.example.com" always;
        add_header Access-Control-Allow-Methods "GET, POST, OPTIONS, HEAD, PATCH, PUT, DELETE" always;
        add_header Access-Control-Allow-Headers "User-Agent, Authorization, Content-Type" always;

        proxy_pass http://localhost:3000;
    }
}

server {
    listen 80;
    server_name materialious.example.com;

    location / {
        proxy_pass http://localhost:5173;
    }
}

Other

Please open a PR request or issue if you implement this in a different reverse proxy.

Docker compose

version: "3"
services:
  materialious:
    image: wardpearce/materialious
    restart: unless-stopped
    ports:
      - 3001:80
    environment:
      # No trailing backslashes!
      # URL to your proxied Invidious instance
      VITE_DEFAULT_INVIDIOUS_INSTANCE: "https://invidious.materialio.us"

      # URL TO RYD
      VITE_DEFAULT_RETURNYTDISLIKES_INSTANCE: "https://returnyoutubedislikeapi.com"

      # URL to your proxied instance of Materialious
      VITE_DEFAULT_FRONTEND_URL: "https://materialio.us"

      # URL to Sponsorblock
      VITE_DEFAULT_SPONSERBLOCK_INSTANCE: "https://sponsor.ajay.app"