whatismyip with starlette behind a reverse proxy

from starlette.applications import Starlette
from starlette.responses import JSONResponse
import uvicorn


app = Starlette(debug=False)


@app.route("/whatismyip")
@app.route("/")
async def homepage(request):
    response = JSONResponse({"ip": request.headers["x-real-ip"]})
    return response



if __name__ == "__main__":
    uvicorn.run("main:app", host="127.0.0.1", port=5001, log_level="info")