我正在为一个学校作业制作一个python代理服务器,我得到了下面的代码。当我在我的命令提示符中运行它并尝试连接到google时,代码没有连接到服务器套接字,但页面仍然连接。老实说,我不知道为什么它甚至不通过连接步骤。有什么想法?
编辑:还有其他关于这方面的作业帖子,但似乎没有一个涉及到第8行的sys.exit()结束脚本的事实(据我所知),每当我们注释掉它时,脚本仍然无法连接服务器套接字,并命中“非法请求”异常。
from socket import *
from urllib2 import HTTPError #Used for 404 Not Found error
import sys
import requests
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)
#POST request extension
print 'Fetching webpage using POST'
r = requests.post('http://httpbin.org/post', data = {'key':'value'})
print 'Printing webpage body'
print r.text
print 'Creating and binding socket for proxy server'
# Create a server socket, bind it to a port and start listening
tcpServerSock = socket(AF_INET, SOCK_STREAM)
# Fill in start.
tcpServerSock.bind(('',8888))
tcpServerSock.listen(10) #the number is the maximum number of connections we want to have
# Fill in end.
while 1:
# Start receiving data from the client
print 'Ready to serve...'
tcpClientSock, addr = tcpServerSock.accept()
print 'Received a connection from:', addr
# Fill in start.
message = tcpClientSock.recv(4096) #receive data with buffer size 4096
# Fill in end.
print 'Printing message'
print message
# Extract the filename from the given message
print message.split()[1]
filename = message.split()[1].partition("/")[2]
print '\n'
print 'Printing file name'
print filename
fileExist = "false"
filetouse = "/" + filename
print '\n'
print 'Printing file to use'
print filetouse
print '\n'
try:
# Check whether the file exist in the cache
f = open(filetouse[1:], "r")
outputdata = f.readlines()
fileExist = "true"
# ProxyServer finds a cache hit and generates a response message
tcpClientSock.send("HTTP/1.0 200 OK\r\n")
tcpClientSock.send("Content-Type:text/html\r\n")
# Fill in start.
for x in range(0,len(outputdata)):
tcpClientSock.send(outputdata[x])
# Fill in end.
print 'Read from cache\n'
# Error handling for file not found in cache
except IOError:
if fileExist == "false":
# Create a socket on the proxyserver
# Fill in start.
print 'Creating server socket\n'
c = socket(AF_INET, SOCK_STREAM)
# Fill in end.
hostn = filename
#hostn = filename.replace("www.","",1)
print 'Printing host to connect'
print hostn
print '\n'
print 'Attempting to connect to hostn\n'
try:
# Connect to the socket to port 80
# Fill in start.
c.connect((hostn,80)) #port 80 is used for http web pages
# Fill in end.
# Create 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")
# Show what request was made
print "GET "+"http://" + filename + " HTTP/1.0"
# Read the response into buffer
# Fill in start.
buff = fileobj.readlines() #reads until EOF and returns a list with the lines read
# Fill in end.
# 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") #creates the temp file for the requested file
# Fill in start.
for x in range(0, len(buff)):
tmpFile.write(buff[x]) #writes the buffer response into the temp file (cache?)
tcpClientSock.send(buff[x]) #sends the response saved in the buffer to the client
# Fill in end.
tmpFile.close()
except:
print "Illegal request\n"
else:
# HTTP response message for file not found
# Fill in start.
print 'File not found'
# Fill in end.
#404 not found error handling
except HTTPError as e:
print 'The server couldn\'t fulfill the request.'
print 'Error code: ', e.code
# Close the client and the server sockets
tcpClientSock.close()
# Fill in start.
tcpServerSock.close()
# Fill in end
发布于 2018-07-13 07:35:23
我知道这个问题很老了,而且Jose M的任务可能早就该完成了。
if len(sys.argv) <= 1:
检查需要传递的另一个参数,即服务器的IP。注释掉出口实质上消除了错误检查。
对上面代码的修复是将第20行从此tcpSerSock.bind(('', 8888))
更改为此tcpSerSock.bind((sys.argv[1], tcpSerPort))
然后,您必须正确地调用脚本python ProxyServer.py 127.0.0.1
。
https://stackoverflow.com/questions/43549971
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