Guys please i am going nuts.

i have a node js application that i've built with express js and in the local development it works fine and there is no problem when i am sending a post request to http://localhost:3001/api/v1/cart/add-package, POST-METHOD , it works fine and it sends the request even when i run the build version, it works fine, but when i commit it to github and deploy that new version on railway and i try to send the same request again but to the public domain, it gives 404 can't get api/v1/cart/add-package. please some helpppppppppppppp.... i even deleted the project and deployed it once again and nothing works, i had this problem before and i added a single commnet to the code so i can commit again and deploy and it worked!!!!!!!!, even that i didn't do any changes. but this time nothing would work for me.