update: changed the allowed origins to the public URL of the frontend and it works. I wonder if there's a better way to do this using the internal railway network maybe?

Hi, I have several Spring Boot applications deployed on Railway without any problem, but you have to consider an optimal configuration of the CORS in order to be able to make the communication in an optimal way between the frontend and the backend.

there is! instead of using your backend’s public url while hosted, use its private url. Make sure to use the environment variable rather than hardcoding and set the public URL as the default if the environment variable isn’t available so you can continue developing locally!

For using the private url, how would I configure this with the port and everything? I'm having a bit of a hard time getting them to work

Do you have a brief example of how you got your CORS configuration to work for such cases?

take a look at the docs here https://docs.railway.com/reference/private-networking

Ah, I tried but it didn't help me that much. Examples help me best but I will keep looking <:salute_guy:1244814929630855188>

This may help you https://www.baeldung.com/spring-cors

!s