# !/usr/bin/python3
# -*-coding:UTF-8-*-

import socket

def web_connect():

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)    # 创建一个IPv4的socket
    s.connect(('www.sina.com.cn', 80))    # 建立与服务器源地址(host, port)的连接
    s.send(b'GET / HTTP/1.1\r\nHost: www.sina.com.cn\r\nConnection: close\r\n\r\n')

    # 接收数据:
    buffer = []  # 缓冲容器
    while True:
        d = s.recv(1024)  # recv(max)每次最多接收1k字节
        if d:
            buffer.append(d)
        else:  # 空数据，退出
            break
    data = b''.join(buffer)  # 连接字节数据
    s.close()  # 关闭连接

    header, html = data.split(b'\r\n\r\n', 1)  # HTTP头和网页分离
    print(header.decode('utf-8'))

    with open('sina.html', 'wb') as f:  # 接收的数据写入文件
        f.write(html)

if __name__ == '__main__':
    web_connect()

运行结果：

D:\Python37\python.exe D:/Python37/Code/socket_connect.py
HTTP/1.1 302 Moved Temporarily
Server: nginx
Date: Wed, 07 Aug 2019 16:26:02 GMT
Content-Type: text/html
Content-Length: 154
Connection: close
Location: https://www.sina.com.cn/
X-Via-CDN: f=edge,s=ctc.xiamen.ha2ts4.43.nb.sinaedge.com,c=119.133.210.176;
X-Via-Edge: 1565195162639b0d285773cd64cde1bae90ce

进程已结束，退出代码 0