Question

我认为实现这个代理服务器会很酷。目前对套接字编程很新，但是你将如何制作一个与代理交互的客户端程序，并通过代理向多个Web服务器发送HTTP GET请求（例如：reddit.com，google.com，yahoo.com ）？另外我如何运行代理来测试它是否正常工作？

代理代码：

from socket import *
import sys

if len(sys.argv) <= 1:
    print 'Usage : Python ProxyServer.py server_ip"\n[server_ip : It is the IP address of Proxy Server'
sys.exit(2)
#create a server socket, bind it to a port and start listening
tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerPort = 8888
tcpSerSock.bind(("", tcpSerPort))
tcpSerSock.listen(5)

while 1:
#start recieving data from the client
    print 'Ready to serve...'
tcpCliSock, addr = tcpSerSock.accept()
print 'Recieved a connection from:', addr
message = tcpCliSock.recv(1024)
print message

#extract the filename from a given message
print message.split()[1]
filename = message.split()[1].partition("/")[2]
print filename
fileExist = "false"
filetouse = "/" + filename
print filetouse

try:
#check wether the file exists in the cache
    f = open(filetouse[1:], "r")
    outputdata = f.readlines()
    fileExist = "true"
    tcpCliSock.send("HTTP/1.0 200 OK\r\n")
    tcpCliSock.send("Content-Type:text/html\r\n")
    for i in range(0, len(outputdata)):
        tcpCliSock.send(outputdata[i])
    print 'Read from cache'

#Error handeling for file not in cache

except IOError:
    if fileExist == "false":
#creates a socket on the proxyserver
        c = socket(AF_INET, SOCK_STREAM)
hostn = filename.replace("www.","",1)
print hostn
try:
#connect to the socket to port 80 
    c.connect(hostn,80)
#creates a temporary file on this socket and ask port 80 for the file requested by the client
    fileobj = c.makefile('r', 0)
    fileobj.write("GET "+"http://" + filename + "HTTP/1.0\n\n") 

    #read the response into buffer
    #create a new file in the cache for the requested file
    #also, send the response in the buffer to client socket and the corresponding file in the cache
    tmpFile = open("./" + filename,"wb")
    for i in range(0, len(buff)):
        tmpFile.write(buff[i])
    tcpCliSock.send(buff[i])
except:
    print "Illegal Request"
else:
#HTTP response message for file not found
    print "404 Error file not found"
#close the client and the server sockets
tcpCliSock.close()

if __name__ == '__main__':
    main()

使用OS X 10.10.3和Python 3.4

链接到代码的屏幕截图： https://smartedblog.files.wordpress.com/2013/05/pr4-1.png（第1部分） https://smartedblog.files.wordpress.com/2013/05/pr4-2.png（第2部分）

Answer 1

你有一个永不休息的while循环。

while 1:
    print 'Ready to serve...'

您的代理输出是多少？它看起来应该只打印无限行。您的代理永远不会到达此行tcpCliSock, addr = tcpSerSock.accept()来接受连接。

HTTP代理服务器python [客户端帮助]

1 个答案: