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I'm trying to write a program that changes the content of a webpage with some user given parameters. After several tries and some googling, i've managed to get some results (I put the webserver in a thread in order to continue other tasks in the main routine). It seems to run pretty smooth in windows, but I always got a

socket.error: [Errno 98] Address already in use

when I try it from my linux machine (the whole thing must run on raspian at the end).

I read something here that explains that the SO_REUSEADDR socket option (I think it concerns with) have different behaviours among different OS (and, if I haven't misunderstood, it "works" on Windows thanks to a bug), but I can't find a solution to get it work this way on Linux for this option is already set to True by default.

Here's a simplified absract of the code that generates the error:

import web

probe = raw_input("1st content: ")
web.web(probe)

probe = raw_input("2nd content: ")
web.web(probe)

raw_input()

with this module (web.py)

# -*- coding: utf8 -*-

def web(text):
    from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
    from SocketServer   import ThreadingMixIn
    import threading


    class Handler(BaseHTTPRequestHandler):

        def do_GET(self):
            self.send_response(200)
            self.end_headers()
            self.wfile.write(bytes(text.encode('utf-8')))
            self.wfile.close()
            return

    class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
        allow_reuse_address = True

    server = ThreadedHTTPServer(('', 8080), Handler)
    print 'Now serving, use <Ctrl+C> to break'

    thread = threading.Thread(target = server.serve_forever)
    thread.daemon = True
    thread.start()

Is there a real solution to get rid of this error? Or is there a better way to manage the handler in orger to acchieve my goal?

EDIT: the error occurs after the input of the "2nd content". The 1st instance runs flawlessly, so I can tell for sure that the socket is not used by anything else.

Thanks to all!

Community
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F. Zion
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1 Answers1

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I didn't throughly analize your code, but to me it looks like your linux machine is most likely running some kind of proxy service on port 8080 (standard port used).

Try netstat -tunlp command and see if something didn't already take that port.

Edit: pro tip for another occasion: On windows skype uses ports 80 and 433 by default, it's togglable in properties.

Grzegorz Wójcicki
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