Python服务器“通常只允许每个套接字地址使用一次" [英] Python server "Only one usage of each socket address is normally permitted"

问题描述

我正在尝试在 python 中创建一个非常基本的服务器，它侦听端口，在客户端尝试连接时创建 TCP 连接，接收数据，发回某些内容，然后再次侦听(并无限期地重复该过程).这是我目前所拥有的:

I'm trying to create a very basic server in python that listens in on a port, creates a TCP connection when a client tries to connect, receives data, sends something back, then listens again (and repeats the process indefinitely). This is what I have so far:

from socket import *

serverName = "localhost"
serverPort = 4444
BUFFER_SIZE = 1024

s = socket(AF_INET, SOCK_STREAM)
s.bind((serverName, serverPort))
s.listen(1)

print "Server is ready to receive data..."

while 1:
        newConnection, client = s.accept()
        msg = newConnection.recv(BUFFER_SIZE)

        print msg

        newConnection.send("hello world")
        newConnection.close()

有时这似乎工作得很好(如果我将浏览器指向localhost:4444"，服务器会打印出 HTTP GET 请求，而网页会打印出文本hello world").但是当我在最后几分钟关闭服务器后尝试启动服务器时，偶尔会收到以下错误消息:

Sometimes this seems to work perfectly well (if I point my browser to "localhost:4444" the server prints out the HTTP GET request and the webpage print the text "hello world"). But I'm getting the following error message sporadically when I try to start the server after closing it in the last few minutes:

Traceback (most recent call last):
  File "pathserver.py", line 8, in <module>
    s.bind((serverName, serverPort))
  File "C:Python27libsocket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted

我正在使用 Windows 7 在 python 中编程.关于如何解决这个问题的任何想法?

I'm programming in python using Windows 7. Any ideas on how to fix this?

推荐答案

启用 SO_REUSEADDR 调用 bind() 之前的套接字选项.这允许地址/端口被立即重用，而不是停留在 TIME_WAIT 状态几分钟，等待迟到的数据包到达.

Enable the SO_REUSEADDR socket option before calling bind(). This allows the address/port to be reused immediately instead of it being stuck in the TIME_WAIT state for several minutes, waiting for late packets to arrive.

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

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