如何在无服务器环境变量中获取API网关url

import os

def lambda_handler(event, context):
    api_id = event["requestContext"]["apiId"]
    region = os.environ["AWS_REGION"]
    stage = os.environ["AWS_STAGE"]
    api_gateway_url = f"https://{api_id}.execute-api.{region}.amazonaws.com/{stage}"
    return api_gateway_url

import os
import azure.functions as func

def main(req: func.HttpRequest) -> func.HttpResponse:
    api_gateway_url = f"https://{req.headers['Host']}"
    return func.HttpResponse(api_gateway_url)

import os

def main_handler(event, context):
    api_gateway_domain = os.environ["API_GATEWAY_DOMAIN"]
    api_gateway_url = f"https://{api_gateway_domain}"
    return api_gateway_url