Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <wrw@mac.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: UNSURE 0.395
X-Spam-Level: ***
X-Spam-Evidence: '*H*': 0.24; '*S*': 0.03; 'cc:addr:python-list': 0.11; 'jan': 0.12; 'disconnect': 0.16; 'half.': 0.16; 'received:mac.com': 0.16; 'tcp': 0.16; 'subject:python': 0.16; 'wrote:': 0.18; '(not': 0.18; 'received:10.0.1': 0.19; 'cc:addr:python.org': 0.22; 'cc:2**1': 0.23; '15,': 0.26; 'chris': 0.29; 'am,': 0.29; 'that.': 0.31; 'open': 0.33; 'could': 0.34; 'connection': 0.35; 'but': 0.35; 'done': 0.36; 'charset:us-ascii': 0.36; 'received:10.0': 0.36; 'half': 0.37; 'received:10': 0.37; 'server': 0.38; 'connections': 0.38; 'mine': 0.38; 'received:17': 0.38; 'handle': 0.38; 'issue': 0.38; 'bad': 0.39; "couldn't": 0.39; 'extremely': 0.39; 'users': 0.40; 'even': 0.60; 'solve': 0.60; 'helps': 0.61; 'introduced': 0.61; "you're": 0.61; 'times': 0.62; 'such': 0.63; 'more': 0.64; 'to:addr:gmail.com': 0.65; 'gathering': 0.68; 'internet': 0.71; 'friendly': 0.72; 'carefully': 0.74; 'yourself': 0.78; 'invitation': 0.79; 'protect': 0.79; 'friend': 0.79; '2014,': 0.84; 'break.': 0.84; 'closes': 0.84; 'frustrating': 0.84; 'header:In-reply-to:1': 0.84; 'holes': 0.84; 'off,': 0.84
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.11.87,1.0.14,0.0.0000 definitions=2014-01-15_05:2014-01-15,2014-01-15,1970-01-01 signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1308280000 definitions=main-1401150096
Content-type: text/plain; charset=us-ascii
MIME-version: 1.0 (Mac OS X Mail 6.6 \(1510\))
Subject: Re: Learning python networking
From: William Ray Wing <wrw@mac.com>
In-reply-to: <CAPTjJmpb6yr-VpWypbJQn0a=pNjvNV2CchVBZaK+v_5JoSQOBg@mail.gmail.com>
Date: Wed, 15 Jan 2014 11:25:24 -0500
Content-transfer-encoding: quoted-printable
References: <22d58d76-f2c2-4a1d-8049-3409ac4665d3@googlegroups.com> <mailman.5207.1389223748.18130.python-list@python.org> <9202d352-e065-4f2b-a9e0-e29ce5c68df6@googlegroups.com> <CAPTjJmpb6yr-VpWypbJQn0a=pNjvNV2CchVBZaK+v_5JoSQOBg@mail.gmail.com>
To: Chris Angelico <rosuav@gmail.com>
X-Mailer: Apple Mail (2.1510)
X-Mailman-Approved-At: Wed, 15 Jan 2014 21:57:01 +0100
Cc: "python-list@python.org" <python-list@python.org>, William Ray Wing <wrw@mac.com>
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.5542.1389819423.18130.python-list@python.org>
Lines: 24
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1389819423 news.xs4all.nl 2838 [2001:888:2000:d::a6]:53866
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:64015

On Jan 15, 2014, at 7:52 AM, Chris Angelico <rosuav@gmail.com> wrote:

[megabyte]

> One of the fundamentals of the internet is that connections *will*
> break. A friend of mine introduced me to Magic: The Gathering via a
> program that couldn't handle drop-outs, and it got extremely
> frustrating - we couldn't get a game going. Build your server such
> that your clients can disconnect and reconnect, and you protect
> yourself against half the problem; allow them to connect and kick the
> other connection off, and you solve the other half. (Sometimes, the
> server won't know that the client has gone, so it helps to be able to
> kick like that.) It might not be an issue when you're playing around
> with localhost, and you could even get away with it on a LAN, but on
> the internet, it's so much more friendly to your users to let them
> connect multiple times like that.

But note VERY carefully that this can open HUGE security holes if not =
done with extreme care.

Leaving a dangling connection (not session, TCP closes sessions) open is =
an invitation so bad things happening.

-Bill=