Web服務(wù)器

• 當(dāng)一個(gè)客戶（瀏覽器）聯(lián)系時(shí)創(chuàng)建一個(gè)連接套接字；
• 從這個(gè)連接接收HTTP請求；
• 解釋該請求以確定所請求的特定文件；
• 從服務(wù)器的文件系統(tǒng)獲得請求的文件；
• 創(chuàng)建一個(gè)由請求的文件組成的HTTP響應(yīng)報(bào)文，報(bào)文前面有首部行；
• 經(jīng)TCP連接向請求的瀏覽器發(fā)送響應(yīng)。如果瀏覽器請求一個(gè)在該服務(wù)器中不存在的文件，服務(wù)器應(yīng)當(dāng)返回一個(gè)“404 Not Found”差錯(cuò)報(bào)文。

代碼實(shí)現(xiàn)

#import socket module
from socket import *
serverSocket = socket(AF_INET,SOCK_STREAM)
#Prepare a server socket
serverSocket.bind(('',80))
serverSocket.listen(5)
while True:
    print('Ready to server')
    connectionSocket, addr = serverSocket.accept()
    try:
        message = connectionSocket.recv(1024)
        filename = message.split()[1]
        f = open(filename[1:])
        outputdata = f.read()
        #Send one HTTP header line into socket
        header ='\nHTTP/1.1 200 OK\n\n'
        connectionSocket.send(header.encode('utf-8'))
        #Send the content of the requested file to the client
        for i in range(0,len(outputdata)):
            connectionSocket.send(outputdata[i].encode('utf-8'))
        connectionSocket.close()
    except Exception:
        #Send response message for file not found
        header = '\nHTTP/1.1 404 Not Found\n\n'
        connectionSocket.send(header.encode('utf-8'))
        #Close client socket
        connectionSocket.close()