My react frontend don't get json data from my spring boot backend - both on railway

Question

I have a backend endpoint like this:loge-manager-be-production.up.railway.appIn my code I set the url to this to post a login request:https//:loge-manager-be-production.up.railway.app/api/auth/loginBut when I check the URL in chrome developer console the frontend server and backend server URLs concatenated like this:https://logemanager.up.railway.app/https//:loge-manager-be-production.up.railway.app/api/auth/loginWhich ends up giving me a 404 Not found respons. Does anyone know what is happening? Have I done something wrong or is it the new proxy at railway that causes my problems?