客户端http从服务器获取指定的页面

import socket
import re


def service_client(new_socket):
    """为这个客户端返回数据"""

    request = new_socket.recv(1024).decode("utf-8")
    # splitlines() 按照行('\r', '\r\n', \n')分隔，返回一个包含各行作为元素的列表
    request_lines = request.splitlines()
    if not request_lines:
        pass
    else:
        print("")
        print(">" * 20)
        print(request_lines)

    file_name = ""
    # 使用正则表达式过滤出客户端请求的网页
    ret = re.match(r"[^/]+(/[^ ]*)", request_lines[0])
    if ret:
        file_name = ret.group(1)
        # print("*"*50, file_name)
        # 如果客户端未指定网页，则默认返回index.html
        if file_name == "/":
            file_name = "/index.html"

    # 2. 返回http格式的数据，给浏览器

    try:
        #从html文件夹下打开客户端请求的页面
        f = open("./html" + file_name, "rb")
    # 如果没有用户请求的页面，则返回404信息
    except BaseException:
        response = "HTTP/1.1 404 NOT FOUND\r\n"
        response += "\r\n"
        response += "------file not found-----"
        new_socket.send(response.encode("utf-8"))
    else:
        html_content = f.read()
        f.close()
        # 2.1 准备发送给浏览器的数据---header
        response = "HTTP/1.1 200 OK\r\n"
        response += "\r\n"

        # 将response header发送给浏览器
        new_socket.send(response.encode("utf-8"))
        # 将response body发送给浏览器
        new_socket.send(html_content)

    # 关闭套接
    new_socket.close()


def main():
    """用来完成整体的控制"""
    # 1. 创建套接字
    tcp_server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    # 允许端口复用
    tcp_server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

    # 2. 绑定
    tcp_server_socket.bind(("", 8080))

    # 3. 变为监听套接字
    tcp_server_socket.listen(128)

    while True:
        # 4. 等待新客户端的链接
        new_socket, client_addr = tcp_server_socket.accept()

        # 5. 为这个客户端服务
        service_client(new_socket)

    # 关闭监听套接字
    tcp_server_socket.close()


if __name__ == "__main__":
    main()