"""第5-2课标准示例：解析URL并构造HTTP请求信息。"""

from urllib.parse import parse_qs, urlencode, urlsplit


def parse_url(url: str) -> None:
    """拆分URL，并把查询字符串转换成便于使用的字典。"""

    parts = urlsplit(url)
    query_parameters = parse_qs(parts.query)
    print(f"协议：{parts.scheme}")
    print(f"主机：{parts.hostname}")
    print(f"端口：{parts.port}")
    print(f"路径：{parts.path}")
    print(f"查询参数：{query_parameters}")


def build_request_target(path: str, parameters: dict) -> str:
    """把路径和查询参数编码成请求目标。"""

    return f"{path}?{urlencode(parameters)}"


def main() -> None:
    """展示URL各部分以及一份简化的GET请求。"""

    url = "https://api.example.com:443/books?keyword=Python&page=2"
    parse_url(url)
    request_target = build_request_target(
        "/books",
        {"keyword": "Python Web", "page": 1},
    )
    print(f"请求行：GET {request_target} HTTP/1.1")
    print("请求头：Accept: application/json")


if __name__ == "__main__":
    main()