Mailman 3 January 2017 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince March 3, 2022

March 3, 2022

I am plannig to upgrade twisted's buildbot in the near future. In preperation for that, I am going to take down the production buildbot on Tuesday, June 26, around 1600 UTC[1]. During that time, the result of any builds done will be lost. Thus, I'd ask that people avoid committing to trunk during that time. I will send a reminder before I take down the buildbot both here, and on #twisted and #twisted-dev. Tom [1] http://timeanddate.com/worldclock/meetingtime.html?iso=20120626&p1=80&p2=22…

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[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

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May 1, 2019

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8 10

[Twisted-Python] "twistd" in Twisted 16.4.0 can't import modules/packages from current working directory
by Yuri Feb. 14, 2017

Feb. 14, 2017

Hi all I couldn't find Twisted-specific group, so posting here. Recently Twisted 16.4.0 got released. Yesterday I've tried to upgrade it for my apps and got an error. I've created simple example, which demonstrates it. File service.tac: ======================================= import os from twisted.application import service, internet import mymodule application = service.Application("Demo application") ---------------------------------------- File mymodule.py: ======================================== def myfunction(asd): """ Stub function """ ---------------------------------------- If you try to run it with twistd -y service.tac you'll get an error: == output ============================== Unhandled Error Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 648, in run runApp(config) File "/usr/local/lib/python2.7/site-packages/twisted/scripts/twistd.py", line 25, in runApp _SomeApplicationRunner(config).run() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 379, in run self.application = self.createOrGetApplication() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 444, in createOrGetApplication application = getApplication(self.config, passphrase) --- <exception caught here> --- File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 455, in getApplication application = service.loadApplication(filename, style, passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/application/service.py", line 411, in loadApplication passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/persisted/sob.py", line 223, in loadValueFromFile eval(codeObj, d, d) File "service.tac", line 7, in <module> import mymodule exceptions.ImportError: No module named mymodule Failed to load application: No module named mymodule ---------------------------------------- The errors comes down to this: twistd script does not add current working directory to python path (or removes it, I don't know what exactly happens), so it fails to import any packages/modules from it. The issue does not appear in previous version (Twisted 16.3.2). Any ideas what caused it?

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[Twisted-Python] web client FileBodyProducer - transfer encoding
by Kevin Mcintyre Jan. 31, 2017

Jan. 31, 2017

hey all - quick question. Trying to understand FileBodyProducer as it pertains to POST. json_body = FileBodyProducer(StringIO(json.dumps({'key': 'value'}))) agent.request("POST", ~*uri*, Headers({'User-Agent': ['AkamaiTest']}), json_body) Does the agent chunk the POST body? Is this controllable? Any insight appreciated!

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[Twisted-Python] Twisted Mailing List Archive Search
by Роман Мещеряков Jan. 30, 2017

Jan. 30, 2017

2 4

[Twisted-Python] Twisted 17.1.0rc1 Release Candidate Announcement
by Amber Hawkie Brown Jan. 30, 2017

Jan. 30, 2017

Hello everyone! 16.7 didn't go as well as planned, so I thought we'd try again in the new year! So, here is Twisted 17.1, the first release of 2017. It's got all the cool things that were going to be in 16.7, *and more*. Wow! - twisted.web.client.Agent now supports IPv6! It's also now the primary web client in Twisted, with twisted.web.client.getPage being deprecated in favour of it and Treq. - twisted.web.server has had many cleanups revolving around timing out inactive clients. - twisted.internet.ssl.CertificateOptions has had its `method` argument deprecated, in favour of the new raiseMinimumTo, lowerMaximumSecurityTo, and insecurelyLowerMinimumTo arguments, which take TLSVersion arguments. This allows you to better give a range of versions of TLS you wish to negotiate, rather than forcing yourself to any one version. - twisted.internet.ssl.CertificateOptions will use OpenSSL's MODE_RELEASE_BUFFERS, which will let it free unused memory that was held by idle TLS connections. - You can now call the new twist runner with `python -m twisted`. - twisted.conch.ssh now has some ECDH key exchange support and supports `hmac-sha2-384`. - Better Unicode support in twisted.internet.reactor.spawnProcess, especially on Windows on Python 3.6. - More Python 3 porting in Conch, and more under-the-hood changes to facilitate a Twisted-wide jump to new-style classes only on Python 2 in 2018/2019. This release has also been tested on Python 3.6 on Linux. - Lots of deprecated code removals, to make a sleeker, less confusing Twisted. - 60+ closed tickets. You can get the tarball and the NEWS file at https://twistedmatrix.com/Releases/rc/17.1.0rc1/ <https://twistedmatrix.com/Releases/rc/17.1.0rc1/> , or you can try it out from PyPI: python -m pip install Twisted==17.1.0rc1 Please test it, and let me know how your applications fare, good or bad! If nothing comes up, 17.1 will release in a week. A bit more hopeful this time, Amber Brown

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Jan. 29, 2017

Jan. 29, 2017

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[Twisted-Python] Can't create ticket in Trac
by Craig Rodrigues Jan. 28, 2017

Jan. 28, 2017

Hi, I can't seem to create a ticket in Trac. Can someone look? -- Craig

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[Twisted-Python] Problems with inlineCallback, Deferred, yield and Python 3 in buildbot
by Craig Rodrigues Jan. 26, 2017

Jan. 26, 2017

Hi, I have been submitting many patches to get buildbot working on Python 3: http://bit.ly/2jCCMPW I have run into one problem involving inlineCallback, Deferred, and yield which I am having difficulty solving. Can someone help me? If I do the following inside a Python 3 virtualenv to set things up: git clone https://github.com/buildbot/buildbot buildbot_test cd buildbot_test pip install -e pkg pip install -e worker pip install -e 'master[tls,tests]' trial buildbot.test.unit.test_process_buildrequestdistributor I get this error: ================================================================== File "/Users/crodrigues/buildbot_test/master/buildbot/process/buildrequestdistributor.py", line 93, in <lambda>^M brdicts.sort(key=lambda brd: brd['submitted_at']) builtins.TypeError: 'Deferred' object is not subscriptable buildbot.test.unit.test_process_buildrequestdistributor.TestMaybeStartBuilds.test_slow_db^M ================================================================== The code causing this problem is on line 93 of master/buildbot/process/buildrequestdistributor.py: 78 @defer.inlineCallbacks 79 def _fetchUnclaimedBrdicts(self): 80 # Sets up a cache of all the unclaimed brdicts. The cache is 81 # saved at self.unclaimedBrdicts cache. If the cache already 82 # exists, this function does nothing. If a refetch is desired, set 83 # the self.unclaimedBrdicts to None before calling.""" 84 if self.unclaimedBrdicts is None: 85 # TODO: use order of the DATA API 86 brdicts = yield self.master.data.get(('builders', 87 (yield self.bldr.getBuilderId()), 88 'buildrequests'), 89 [resultspec.Filter('claimed', 90 'eq', 91 [False])]) 92 # sort by submitted_at, so the first is the oldest 93 brdicts.sort(key=lambda brd: brd['submitted_at']) 94 self.unclaimedBrdicts = brdicts 95 defer.returnValue(self.unclaimedBrdicts) If I run the test on Python 2, I don't get the error, and on line 93, brdicts is a dict. However, if I run the test on Python 3, brdicts is a Deferred, thus the error. Can someone point me in the right direction for solving this problem? I am not so familiar with the differences in generators and Deferreds between Python 2 and 3. Thanks. -- Craig

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[Twisted-Python] Can’t change namespace for the Logger instance
by Роман Мещеряков Jan. 23, 2017

Jan. 23, 2017

2 2

[Twisted-Python] admin/pr_as_branch
by Jean-Paul Calderone Jan. 23, 2017

Jan. 23, 2017

Hello, I didn't find any hints about the workflow surrounding the admin/pr_as_branch tool so I invented one and wrote it up on the wiki: https://twistedmatrix.com/trac/wiki/ReviewProcess?action=diff&version=76 Jean-Paul

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Jan. 22, 2017

Jan. 22, 2017

1 0

[Twisted-Python] conch problem with ecdsa-sha2-nistp256 host key?
by Craig Rodrigues Jan. 21, 2017

Jan. 21, 2017

Hi, I filed this bug: https://twistedmatrix.com/trac/ticket/8931 At least for me, conch fails to parse a host key created by OpenSSH in ~/.ssh/known_hosts which is of type ecdsa-sha2-nistp256. Anyone have an idea as to how to fix this? -- Craig

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[Twisted-Python] 外贸软件自主研发，六年积累的外贸软件品牌
by Sunsesoft.Du Jan. 20, 2017

Jan. 20, 2017

1 0

[Twisted-Python] How to get caller’s IP address in Perspective Broker server
by Роман Мещеряков Jan. 20, 2017

Jan. 20, 2017

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[Twisted-Python] Strange ImportError after switching from OS package to pip
by Роман Мещеряков Jan. 18, 2017

Jan. 18, 2017

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[Twisted-Python] suggestions sought on multi-service application dealing with shared database issue
by Jonathan Vanasco Jan. 18, 2017

Jan. 18, 2017

I have a few ideas on how to handle this, but wanted to see if anyone else has dealt with this and has a recommended approach: I have a twisted daemon that I will loosely describe as this: * an application defined in a `.tac` file that is an instance of `twisted.application.service.Application` * multiple user-defined services (IIRC 8 or 9) that are subclasses as twisted.application.internet.TimeService * the services are added to the application via `setServiceParent` * the reactor is started via `twisted.internet.reactor.run()` I've run into an annoying issue a few times, and need to temporarily suspend all/most of the services from running... an internal backup script occasionally breaks (on a new edge case every time we fix it) and ends up consuming 100% of disk space. This cascades into database failures in my application. I've got an external service monitoring disk-space and alerting me. It's presently shutting down the twisted daemon when the error happens, but I'd like to keep twisted running and just adapt to the server conditions. The two ideas I had so far: 1. Create a new service that monitors server conditions and can call stopService/startService on registered services as needed 2. Keep all the services running, but put a conditional check in the timer service's callable has anyone preferred one of these, or something different, in the past?

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[Twisted-Python] Streaming Requests
by Mark Williams Jan. 17, 2017

Jan. 17, 2017

* What? A new year means renewed ambition. So let's talk about receiving streaming requests! * Why? Twisted's HTTP server implementation does not allow application code to interact with a request until its body has been entirely received. It also doesn't allow incremental access to the request's body as it arrives. This shortcoming has been an issue for a while; see http://twistedmatrix.com/trac/ticket/288 Some of the discussion in #288 focuses on twisted.web.server and twisted.web.resource. The approach I'll propose in this email will not. There are two reasons for this. The first: I want twisted.web.proxy.Proxy to support the CONNECT HTTP method. That requires that Request.process be called before any part of the body has been written by the client. I'd also like to write proxies that connected the incoming request as an IPushProducer to an outgoing one as an IConsumer. It just so happens that Proxy inherits directly from HTTPChannel and doesn't touch any of twisted.web.server. The second: the consensus after some discussion on IRC in #twisted-dev seems to be that we have to fix HTTPChannel first anyway, and that progress there can be made entirely in Twisted's private API. Once we have some kind of Request-like thing that HTTPChannel can begin processing before the body has arrived, we can work out how to integrate it in twisted.web.server and and twisted.web.resource. In other words, we can make this change incrementally and backwards-compatibly, and get a better Proxy implementation out of it, too. * Quickly: How? 1. Define the Request interface HTTPChannel currently uses. It will be private. Call it _IDeprecatedHTTPChannelToRequestInterface because requests should eventually always be streaming. There's a ticket here: https://twistedmatrix.com/trac/ticket/8981 and some code here: https://github.com/twisted/twisted/compare/twisted:88a7194...markrwilliams:… 2. Define a new streaming Request interface that HTTPChannel knows how to use. It will be private. Call it _IHTTPChannelToStreamingRequest. It won't have a .content, but it will have a way to specify a protocol that receives the body incrementally. The interaction will probably look a lot like the patch in https://twistedmatrix.com/trac/ticket/8143. It won't be HTTPChannel's default requestFactory. 3. Use the private _IHTTPChannelToStreamingRequest implementation in a new proxy implementation that supports CONNECT and also producer/consumer streaming between the client and proxy requests. 4. Take stock and figure out how to make things work for twisted.web.server. * Slowly: How? (Note: attributions are for posterity only. Any mistakes in reasoning are because I transcribed something badly.) Tom Prince explained that HTTPChannel doesn't provide Request with the HTTP method, URI, or version until the body has arrived. Request.requestReceived, the method that receives these, calls Request.process, which means without change this behavior we can't change Proxy or Site, both of which begin their work by overriding Request.process. So we have to start with HTTPChannel. (For what it's worth, http://twistedmatrix.com/trac/ticket/288#comment:31 supports this approach.) He also noted that the Request interface with which HTTPChannel interacts is mostly not described by twisted.iweb.IRequest. That means we can augment the ways HTTPChannel talks to Request-like things without breaking many public APIs. Glyph said we should make this existing interface explicit but private. That will let HTTPChannel (eventually) use the interface provided by requestFactory to determine whether to treat the Request as streaming or not. We can then define a new interface, _IHTTPChannelToStreamingRequest, and a new implementation that's completely separate from twisted.web.http.Request. Both will be private. Tom Prince pointed out that with these two in place, we can then write a replacement for twisted.web.proxy.Proxy that uses these private APIs to provide HTTPS support via HTTP's CONNECT method. HTTPChannel's default requestFactory will continue to be twisted.web.http.Request. The new proxy code will use the new _IHTTPChannelToStreamingRequest implementation. Exarkun pointed out that this new proxy implementation can be completely separate and indeed deprecate the existing one, avoiding the need to make twisted.web.proxy.ProxyRequest.process work with both the new _IHTTPChannelToStreamingRequest process() implementation and the existing one. I am hopeful this new implementation will also close https://twistedmatrix.com/trac/ticket/8961 If all that works, we can then work out an IStreamingRequest interface that will enable Twisted's web server utilize the private streaming request APIs. * Comments? Will this approach break a public API? Does it sound terrible? Or good? Please share your thoughts! Let's hope 2017 is the year of the streaming request! -Mark

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Jan. 15, 2017

Jan. 15, 2017

1 0

[Twisted-Python] Twisted 16.7.0rc2 Release Candidate Announcement
by Amber "Hawkie" Brown Jan. 12, 2017

Jan. 12, 2017

Happy new year! Twisted 16.7.0rc2 is out, with a bugfix for a problem scrapy ran into. Sorry for the delay in 16.7 final, we've had a few regression reports, and we've made sure to follow them all up and get to the bottom of them before we did the release! You can get the tarball and the NEWS file at https://twistedmatrix.com/Releases/rc/16.7.0rc2/ <https://twistedmatrix.com/Releases/rc/16.7.0rc2/> , or you can try it out from PyPI: python -m pip install Twisted==16.7.0rc2 Please test it, and let me know how your applications fare, good or bad! It will release this weekend if nothing is reported. Regards, Amber Brown

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[Twisted-Python] treq POST abborting with: err: ('Could not adapt', '{"....", "..."} <InterfaceClass twisted.web.iweb.IBodyProducer>)
by steven meiers Jan. 12, 2017

Jan. 12, 2017

hi, sending a simple post request with a body (cookies) results in a error here. im using python 3.x with the latest twisted and treq installed via pip in a virtualenv. the code gets a chatroom login page, extracts two values, gets the cookies and logs a user into the chat. (incomplete) thing is for being logged in i need to send my current phpsessionid in the post request... glyph (without seeing the the code or backtrace) suggested that: "I think the issue might be that it doesn't support bytes() on py3, it's registered against str() or something" here is my code: from myhttp import getLoginPage, login from twisted.internet import reactor def myPrint(result): print("result:", result) def myError(failure): print("failure:", failure) def lala(): #d = getLoginPage() d = login() d.addCallback(myPrint) d.addErrback(myError) if __name__ == '__main__': lala() reactor.run() from myhttp import getLoginPage, login from twisted.internet import reactor def myPrint(result): print("result:", result) def myError(failure): print("failure:", failure) def lala(): #d = getLoginPage() d = login() d.addCallback(myPrint) d.addErrback(myError) if __name__ == '__main__': lala() reactor.run() (venv) julius@t560:~/code/twisted/webchat-client$ cat myhttp.py from bs4 import BeautifulSoup import random from twisted.internet import reactor, defer from twisted.web.client import getPage import treq import urllib url = b'http://chatroom2000.de' useragent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36".encode('utf-8') cookies = {} @defer.inlineCallbacks def getLoginPage(): global cookies response = yield treq.get(url) final_page = yield response.content() cookies = response.cookies() defer.returnValue(final_page) @defer.inlineCallbacks def login(): response = yield getLoginPage() print(cookies) print("rsponse:", response) soup = BeautifulSoup(response, "lxml") hmac = soup.input["name"] key = soup.input["value"] print("hmac:key", hmac,key) username_list = ["Demetrius", "Tyrone", "Marshawn"] username = random.choice(username_list) body = urllib.parse.urlencode({hmac: key, 'username': username, 'pw':'', 'gender':'m', 'aaaa':''}) target_url = url + b"/?CheckUserName" headers = {'Content-Type': 'application/x-www-form- urlencoded','cache-control': ['no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0']} import json try: print("cookies2:", cookies) somepage = yield treq.post(target_url, json.dumps({hmac: key, "username": username, 'pw':'', 'gender':'m', 'aaaa':''}), headers=headers, cookies=cookies ) except Exception as err: print("err:", err) response = yield somepage.content() defer.returnValue(response) if __name__ == '__main__': #url = 'http://chatroom2000.de' getPage(url) reactor.run() and the error: cookies2: <RequestsCookieJar[<Cookie PHPSESSID=jevr00m25j0clfv6aibbgbro26 for chatroom2000.de/>, <Cookie db1_cookie_test=1483729313 for chatroom2000.de/>]> err: ('Could not adapt', '{"pw": "", "aaaa": "", "username": "Demetrius", "cd5a6e4774acfd7e090467c9ed67f7e6": "1483729313", "gender": "m"}', <InterfaceClass twisted.web.iweb.IBodyProducer>) failure: [Failure instance: Traceback: <class 'UnboundLocalError'>: local variable 'somepage' referenced before assignment /home/julius/code/twisted/webchat-client/venv/lib/python3.5/site- packages/twisted/internet/defer.py:457:callback /home/julius/code/twisted/webchat-client/venv/lib/python3.5/site- packages/twisted/internet/defer.py:565:_startRunCallbacks /home/julius/code/twisted/webchat-client/venv/lib/python3.5/site- packages/twisted/internet/defer.py:651:_runCallbacks /home/julius/code/twisted/webchat-client/venv/lib/python3.5/site- packages/twisted/internet/defer.py:1355:gotResult --- <exception caught here> --- /home/julius/code/twisted/webchat-client/venv/lib/python3.5/site- packages/twisted/internet/defer.py:1299:_inlineCallbacks /home/julius/code/twisted/webchat-client/myhttp.py:54:login i followd some files in the traceback, but got nowhere :(

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[Twisted-Python] txtorcon 0.18.0
by meejah Jan. 12, 2017

Jan. 12, 2017

2 2

[Twisted-Python] txtorcon 0.18.0
by meejah Jan. 12, 2017

Jan. 12, 2017

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 txtorcon 0.18.0 is released, improving error-reporting when you have SAFECOOKIE or COOKIE authentication turned on but can't read the file. * https://github.com/meejah/txtorcon/issues/200 You can download the release from PyPI or GitHub (or of course "pip install txtorcon"): https://pypi.python.org/pypi/txtorcon/0.18.0 https://github.com/meejah/txtorcon/releases/tag/v0.18.0 Releases are also available from the hidden service: http://timaq4ygg2iegci7.onion/txtorcon-0.18.0.tar.gz http://timaq4ygg2iegci7.onion/txtorcon-0.18.0.tar.gz.asc You can verify the sha256sum of both by running the following 4 lines in a shell wherever you have the files downloaded: cat <<EOF | sha256sum --check 12be80f1d5e2893378c6e8c752cf159479f868f8424e16b34b75cd679a0ab171 dist/txtorcon-0.18.0.tar.gz cffe063dbcedd9d344e88a572c0de39b0390562165a865efa27019260c2119f6 dist/txtorcon-0.18.0-py2-none-any.whl EOF thanks, meejah -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJYdp4sAAoJEMJgKAMSgGmnxCIH/iiFJdYtbSnShAktDrwMuL6K tJN+AALrr6zIydjIVG4pNuGydoxqtmrpb/12xNn/c7noEWZpuuHd+hn/PRn+XNaA Gh+q4922VKs3ZCFYFClVAkZFtT5iug7EKnB6n0IKt4Z+rVAzRTCpHqgnCmmavHP1 s55jkYc+emC/jzGag22sD7HnPYHjkuKV+qy1Y6mF1//oD9FFhJUXvn5FVjf9cNb/ xta7HB3AMXp/8qdpURPJaJBjWOg1BxSVBngZXYiUJkkoOReOJU1ngDoU0J7VjQJq Uyi2ijwylUnK6/7qLLS8pwyX/UmWgV7NeQgIr00Shsm7Jv+zkk0QhXbnwJo8pRQ= =oJqn -----END PGP SIGNATURE-----

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[Twisted-Python] Announcing txAWS 0.2.3.1
by Jean-Paul Calderone Jan. 9, 2017

Jan. 9, 2017

I've just release txAWS 0.2.3.1. txAWS is a library for interacting with Amazon Web Services (AWS) using Twisted. AWSServiceEndpoint's ssl_hostname_verification's parameter now defaults to True instead of False. This affects all txAWS APIs which issue requests to AWS endpoints. For any application which uses the default AWSServiceEndpoints, the server's TLS certificate will now be verified. This resolves a security issue in which txAWS applications were vulnerable to man-in-the-middle attacks which could either steal sensitive information or, possibly, alter the AWS operation requested. The new release is available on PyPI in source and wheel forms. You can also find txAWS at its new home on github, <https://github.com/twisted/txaws >. Special thanks to Least Authority Enterprises (<https://leastauthority.com/>) for sponsoring the work to find and fix this issue and to publish this new release. Jean-Paul

1 0