tcp与http协议 以及python的实现

htpp协议 Rquest Headers格式：

　　请求方法空格URL空格协议版本回车符换行符

　　头部字段名：值回车符换行符

　　···

　　头部字段名：值回车符换行符

　　回车符换行符

　　请求数据

socket网络聊天

服务端

#sokcet服务断
import socket
import threading
server = socket.socket()
# 绑定到0.0.0.0:8000端口上
server.bind(('0.0.0.0',8000)) # 如果是绑定127.0.0.1,那么只能本地连接
server.listen()

def handle_sock(sock,addr):
    while True:
        # recv是阻塞的
        tmp_data = sock.recv(1024)
        print(tmp_data.decode("utf8"))
        input_data = input()
        sock.send(input_data.encode("utf8"))
# 获取客户端连接并启动线程去处理
while True:
    # 阻塞，等待连接
    sock,addr = server.accept()

    # 启动一个线程去处理新的用户连接
    client_thread = threading.Thread(target=handle_sock,args=(sock,addr))
    client_thread.start()
# sock.close()

客户端

# socket客户端
import socket
client = socket.socket()
client.connect(('192.168.2.129',8000))
while True:

    input_data = input()
    client.send(input_data.encode('utf8'))
    server_data = client.recv(1024)
    print(server_data.decode('utf8'))

client.close()

socket模拟http实现拉取百度首页源码：

# socket客户端
import socket
http_client = socket.socket()
http_client.connect(('www.baidu.com',80))
html = "GET / HTTP/1.1\r\nConnection:close\r\n\r\n"
http_client.send(html.encode("utf8"));

data = b""
while True:
    tmp = http_client.recv(1024)
    if tmp:
        data += tmp;
    else:
        break
print(data.decode('utf8'))
input()

socket模拟http实现nginx接受访问：

#tcp实现http协议
import socket
server = socket.socket()

server.bind(('0.0.0.0',80))
server.listen()
# 获取客户端连接并启动线程去处理
while True:
    print("等待连接")
    # 阻塞，等待连接
    sock,addr = server.accept()
    tmp_data = sock.recv(1024)
    print("收到浏览器信息：")
    print(tmp_data.decode("utf8"))
    # 谷歌浏览器访问 打印为：
    #     GET / HTTP/1.1
    #     Host: 192.168.2.129
    #     Connection: keep-alive
    #     Cache-Control: max-age=0
    #     Upgrade-Insecure-Requests: 1
    #     User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36
    #     Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
    #     Accept-Encoding: gzip, deflate
    #     Accept-Language: zh-CN,zh;q=0.9
    response_template = '''HTTP/1.1 200 OK

    <h1>hello</h1>'''
    sock.send(response_template.encode("utf8"))
    # 浏览器展示形式为：
    #     Request URL: http://192.168.2.129/
    #     Request Method: GET
    #     Status Code: 200 OK
    #     Remote Address: 192.168.2.129:80
    #     Referrer Policy: no-referrer-when-downgrade
    print("已回信息")
    sock.close()
    print("已断开连接")

Rquest Headers