In this blog, I teach you how to write python in github repo to establish a http server.

1. Your main file: app.py should have this code:

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
async def root():
    return {"message": "Hello World"}

2. your railway.json file:

{
  "$schema": "https://railway.app/railway.schema.json",
  "build": {
    "builder": "NIXPACKS"
  },
  "deploy": {
    "startCommand": "uvicorn app:app --host 0.0.0.0 --port \"$PORT\""
  }
}

uvicorn app:app in above means "uvicorn {filename}:{variable name in file}

And you may need a requirements.txt file to help railway to install your dependencies.

After all, you can open railway.app to create a project, and link to the github repo. It will work.