Very Simple flask app example under reverse proxy

app.py

from flask import Flask, Blueprint
from werkzeug.middleware.proxy_fix import ProxyFix

app = Flask(__name__)
app.wsgi_app = ProxyFix(app.wsgi_app)
bp = Blueprint("main", __name__)

@bp.route("/")
def ping():
    return "hi"

app.register_blueprint(bp, url_prefix="/linnil1")

if __name__ == "__main__":
    app.run(host="0.0.0.0",
            port=5000)

This helped me. Thank you.