flask socket 握手流程

import socket, base64, hashlib

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(('127.0.0.1', 9527))
sock.listen(5)
# 获取客户端socket对象
conn, address = sock.accept()
# 获取客户端的【握手】信息
data = conn.recv(1024)
print(data)
"""
GET /ws HTTP/1.1

Host: 127.0.0.1:9527

Connection: Upgrade

Pragma: no-cache

Cache-Control: no-cache

User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Upgrade: websocket

Origin: http://localhost:63342

Sec-WebSocket-Version: 13

Accept-Encoding: gzip, deflate, br

Accept-Language: zh-CN,zh;q=0.9

Cookie: session=a6f96c20-c59e-4f33-84d9-c664a2f29dfc

Sec-WebSocket-Key: MAZZU5DPIxWmhk/UWL2+BA==
  # 建立连接的关键钥匙
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits


"""

# 以下动作是有websockethandler完成的


def get_headers(data):
    header_dict = {}
    header_str = data.decode("utf8")
    for i in header_str.split("
"):
        if str(i).startswith("Sec-WebSocket-Key"):
            header_dict["Sec-WebSocket-Key"] = i.split(":")[1].strip()

    return header_dict

headers = get_headers(data)  # 提取请求头信息

magic_string = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11' # 魔法字符串 只要是websocket永远不会变

value = headers['Sec-WebSocket-Key'] + magic_string # 经过请求头提取的信息和魔法字符串 合成的钥匙

ac = base64.b64encode(hashlib.sha1(value.encode('utf-8')).digest()) # 可以理解为两次解锁 通过钥匙拿到握手验证的关键通行证

# 响应信息 WebSocket-Accept:通行证
response_tpl = "HTTP/1.1 101 Switching Protocols
" 
               "Upgrade:websocket
" 
               "Connection: Upgrade
" 
               "Sec-WebSocket-Accept: %s
" 
               "WebSocket-Location: ws://127.0.0.1:9527

"

response_str = response_tpl % (ac.decode('utf-8'))
# 响应【握手】信息
conn.send(response_str.encode("utf8")) # 向此次向你发送websocket请求的对方返回响应信息 询问是否握手通过

while True:
    msg = conn.recv(8096)
    print(msg)