"""第5-1课标准示例：模拟客户端、服务器和请求响应流程。"""


def browser_send_request(url: str) -> dict:
    """模拟浏览器根据URL创建HTTP请求。"""

    return {
        "method": "GET",
        "url": url,
        "headers": {"Accept": "text/html"},
    }


def server_handle_request(request: dict) -> dict:
    """模拟服务器读取请求并返回HTTP响应。"""

    if request["url"] == "/books":
        return {
            "status": 200,
            "headers": {"Content-Type": "text/html; charset=utf-8"},
            "body": "<h1>图书列表</h1>",
        }
    return {
        "status": 404,
        "headers": {"Content-Type": "text/plain; charset=utf-8"},
        "body": "页面不存在",
    }


def browser_render_response(response: dict) -> None:
    """模拟浏览器检查响应并展示响应体。"""

    print(f"响应状态：{response['status']}")
    print(f"内容类型：{response['headers']['Content-Type']}")
    print(f"浏览器展示：{response['body']}")


def main() -> None:
    """依次模拟发送请求、服务器处理和浏览器展示。"""

    request = browser_send_request("/books")
    print(f"客户端发送：{request['method']} {request['url']}")
    response = server_handle_request(request)
    browser_render_response(response)


if __name__ == "__main__":
    main()