@Jon I’m not sure if I can find this proxy thing in my n8n instance…
I found this thread about likely the same issue: Unable to Make API Call through Flutter (Web)
So Jan there offers to use traefik to add CORS-related headers. I went on and according to the manual updated my docker-compose.yml:
n8n:
...
labels:
...
- traefik.http.middlewares.n8n.headers.accesscontrolallowmethods=GET,OPTIONS,PUT
- traefik.http.middlewares.n8n.headers.accesscontrolallowheaders=*
- traefik.http.middlewares.n8n.headers.accesscontrolalloworiginlist=*
- traefik.http.middlewares.n8n.headers.accesscontrolmaxage=100
- traefik.http.middlewares.n8n.headers.addvaryheader=true
Still not working, alas