03-web服务器v3.1--02

返回固定页面的Http服务器

import socket


def service_client(new_socket):
    """为这个客户端返回数据"""
    # 1. 接收浏览器发送过来的请求，即http请求
    # GET / HTTP 1.1
    request = new_socket.recvfrom(1024)
    print(request)

    # 2. 返回http格式的数据，给浏览器
    # 2.1 准备发送给浏览器的数据---header
    response = "HTTP/1.1 200 OK\r\n"  # 换行
    response += "\r\n"
    # 2.2 准备发送给浏览器的数据---body
    response += "<h1>hello world</h1>"
    new_socket.send(response.encode("utf-8"))

    # 3. 关闭套接字
    new_socket.close()

def main():
    # 1. 创建套接字
    tcp_server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    # 设置当服务器先close 即服务器端4次挥手之后资源能够立即释放，这样就保证了下次运行的时候可以立即使用这个地址
    tcp_server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    # 2. 绑定
    tcp_server_socket.bind(("127.0.0.1", 7890))
    # 3. 变为监听套接字
    tcp_server_socket.listen(128)
    # 4. 等待新客户的链接
    new_socket, client_addr = tcp_server_socket.accept()
    # 5. 为这个客户端服务
    service_client(new_socket)


if __name__ == '__main__':
    main()

tcp的3次握手和4次挥手

3次握手.png
4次挥手.png

Http服务器返回客户端相应网页

import socket
import re


def service_client(new_socket):
    """为这个客户端返回数据"""
    # 1. 接收浏览器发送过来的请求，即http请求
    # GET / HTTP 1.1
    request = new_socket.recv(1024).decode("utf-8 ")
    # print(">" * 50)
    # print(request)

    requet_lines = request.splitlines()
    print("")
    print(">" * 20)
    print(requet_lines)

    # GET /index.html HTTP/1.1
    file_name = ""
    # [ ]的^ 表示取反 即不是/ 不是空格
    ret = re.match(r"[^/]+(/[^ ]*)", requet_lines[0])
    print("-" * 100)
    print(ret)
    print("-" * 100)
    if ret:
        file_name = ret.group(1)
        # print("*" * 50, file_name)
        if file_name == "/":
            file_name = "/index.html"

    try:
        f = open("./html" + file_name, "rb")
    except:
        response = "HTTP/1.1 404 NOT FOUND\r\n"  # 换行
        response += "\r\n"
        response += "---file not found---"
        new_socket.send(response.encode("utf-8"))
    else:
        html_content = f.read()
        f.close()
        # 2. 返回http格式的数据，给浏览器
        # 2.1 准备发送给浏览器的数据---header
        response = "HTTP/1.1 200 OK\r\n"  # 换行
        response += "\r\n"
        # 2.2 准备发送给浏览器的数据---body
        # response += "<h1>hello world</h1>"
        # new_socket.send(response.encode("utf-8"))
        # 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)

    # 3. 关闭套接字
    new_socket.close()


def main():
    # 1. 创建套接字
    tcp_server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    # 设置当服务器先close 即服务器端4次挥手之后资源能够立即释放，这样就保证了下次运行的时候可以立即使用这个地址
    tcp_server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    # 2. 绑定
    tcp_server_socket.bind(("127.0.0.1", 7890))
    # 3. 变为监听套接字
    tcp_server_socket.listen(128)
    while True:
        # 4. 等待新客户的链接
        new_socket, client_addr = tcp_server_socket.accept()
        # 5. 为这个客户端服务
        service_client(new_socket)


if __name__ == '__main__':
    main()