研究了一晚上的代码奉上：

#coding:utf-8

import socket
import re

# 定义一个常量用来接收客户端发起的文件请求地址
# 设置静态文件根目录
HTML_ROOT_DIR = "./html"

from multiprocessing import Process

def handle_client(client_socket):
    """处理客户端请求"""

    # 获取客户端请求
    request_data = client_socket.recv(1024)
    print(request_data)

    # 判断用户发来的请求
    # 使用splitlines来切割不同行
    request_lines = request_data.splitlines()
    for line in request_lines:
        print(line)

    # GET / HTTP/1.1
    request_start_line = request_lines[0]
    file_name = re.match(r"\w+ +(/[^ ]*) ", request_start_line.decode("utf-8")).group(1)

    # 通常把常量写在“左边”，变量写在右边，防止少写一个“=”不报错
    if "/" == file_name:
        file_name = "/index.html"

    # 打开文件，读取内容(客户有可能请求图片资源：加上b)
    try:
        file = open(HTML_ROOT_DIR + file_name, "rb")
    except IOError:
        response_start_line = "HTTP/1.1 404 NOT FOUND\r\n"
        response_headers = "Sever: My Sever\r\n"
        response_body = "The file is not found!"
    else:
        file_data = file.read()
        file.close()

        # 构造响应数据
        response_start_line = "HTTP/1.1 200 OK\r\n"
        response_headers = "Sever: My Sever\r\n"
        response_body = file_data.decode("utf-8")

    response = response_start_line + response_headers + "\r\n" + response_body
    print("response data:", response)


    # 向客户端形响应数据
    client_socket.send(bytes(response, "utf-8"))
    # 关闭客户端连接
    client_socket.close()

if __name__ == "__main__":

    sever_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sever_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sever_socket.bind(("", 8090))
    # 监听队列大小为128
    sever_socket.listen(128)
    # 为多个客户端服务
    while True:
        client_socket, client_address = sever_socket.accept()
        print("[%s, %s]用户连接上了"%client_address)
        handle_client_process = Process(target=handle_client, args = (client_socket,))
        handle_client_process.start()
        client_socket.close()

坑：没有把index.html放在“./html”里面，一直“not found”；要理解每一部分的含义，不能不求甚解

文件请求根目录

运行效果：

运行效果