Cant paste anything, infinite spinning circle

[KagetaneHiruko]

when im trying to paste anything in i get an infinite loading screen, i cant see anything abnormal in the logs, but i got this error in the webconsole right after pasting:

Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

Encountered with opera gx and edge.

Im hosting paaster within docker from a raspberry pi, here is my docker-compose:
version: '3'
services:
starlette:
container_name: paaster_backend
image: wardpearce/paaster-backend
restart: unless-stopped
ports:
- "8888:80"
environment:
MONGO_IP: "paaster_mongodb"
MONGO_PORT: 27017
MONGO_DB: "paaster"
# Nano ID length https://zelark.github.io/nano-id-cc/
NANO_ID_LEN: 21
# Chunk size when sending a encrypted paste back to the client.
READ_CHUNK: 1024
# This is the max paste size of the encrypted data.
MAX_PASTE_SIZE_MB: 3
REDIS_HOST: "paaster_redis"
REDIS_PORT: 6379
# Proxied Frontend URL.
FRONTEND_PROXIED: "http://localhost:8889"
volumes:
# If you change 'SAVE_PATH' this needs to be changed,
# changing 'SAVE_PATH' is not recommended.
- appdata:/app/pastes
depends_on:
- mongodb
networks:
- backend

vite:
container_name: paaster_frontend
image: wardpearce/paaster-frontend
environment:
VITE_BACKEND: "http://localhost:8888"
VITE_NAME: "paaster"
restart: unless-stopped
ports:
- "8889:80"

redis:
container_name: paaster_redis
image: redis
volumes:
- redis:/data
networks:
- backend

mongodb:
image: mongo:4.4.14
container_name: paaster_mongodb
restart: unless-stopped
environment:
MONGODB_DATA_DIR: /data/db
MONDODB_LOG_DIR: /dev/null
volumes:
- mongodbdata:/data/db
networks:
- backend

networks:
backend:
driver: bridge

volumes:
redis:
driver: local
mongodbdata:
driver: local
appdata:
driver: local

[WardPearce]

Hey, this is most likely a CORs issue. both VITE_BACKEND & FRONTEND_PROXIED need to be the exposed address / domain of your hosted instance of paaster (domain assuming you have reversed proxied them).

For paaster.io for example, VITE_BACKEND: "https://api.paaster.io" & FRONTEND_PROXIED: "https://paaster.io"

Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0 this error is due to the web client not actually receiving JSON, whats mostly likely because the VITE_BACKEND isn't pointing at the right location.