{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# {class}`~starlette.requests.Request`\n",
    "\n",
    "参考：[Request](https://fastapi.tiangolo.com/zh/advanced/using-request-directly/)\n",
    "\n",
    "假设你想在你的路径操作函数中获取客户端的 IP 地址/主机。\n",
    "\n",
    "为此，你需要直接访问请求对象。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "from fastapi import FastAPI\n",
    "from starlette.requests import Request\n",
    "\n",
    "app = FastAPI()\n",
    "\n",
    "\n",
    "@app.get(\"/items/{item_id}\")\n",
    "def read_root(item_id: str, request: Request):\n",
    "    client_host = request.client.host\n",
    "    return {\"client_host\": client_host, \"item_id\": item_id}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "通过声明路径操作函数参数，并将其类型设置为 {class}`~starlette.requests.Request`，FastAPI 就会知道将 {class}`~starlette.requests.Request` 传递给那个参数。"
   ]
  }
 ],
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