Strange hangs with Chrome and IE/Edge

[Nico Zanferrari]

Hi,

I've analyzed a bit a strange problem with py4web.

Most of the time, when I open the main page of a local installation with http://127.0.0.1:8000/  I get connection problems. Sometimes it takes few seconds, sometimes it's stuck until I close the page or the full browser.

- it happens only with Chrome  and IE/Edge, Firefox is fine

- when it happens, even Firefox is blocked until I resolve the problem with the other browser

I've discovered traces of a similar problem with Flask, see https://stackoverflow.com/questions/42519629/flask-not-processing-other-http-requests-after-chrome-browser-accesses-the-web-s . By the way the 'prediction service' setting is now called 'preload pages for faster browsing and searching', see https://www.ghacks.net/2019/04/23/missing-chromes-use-a-prediction-service-setting/ 

Indeed, changing this single setting resolve the problem for the latest Chrome version!

Could you confirm this problem? Can we resolve it server-side?

Nico

[Kevin Keller]

Maybe we need to add something like this to py4web?

https://www.electricmonk.nl/log/2016/02/15/multithreaded-dev-web-server-for-the-python-bottle-web-framework/

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[Massimo]

But we already use gevent and or Tornado. Are they not packaged in windows? If not, then we can use rocket, the multithreaded server we built for web2py.

[Massimo]

OK. I settled for waitress as rocket has not been maintained in years and has problem exiiting gracefully. Mind that we do not pass ssl sertificates to waitress at this time. Should be an easy fix but no ssl on windows at this time.

On Saturday, 29 August 2020 at 04:25:37 UTC-7 kell...@gmail.com wrote:

[Nico Zanferrari]

I've already tested the new build and it seems to work fine on the three major browser on Windows !!!

I'm building new binaries (after adding 'waitress' to the needed imports in pyinstaller). By the way, this is what I get in the console - and now it clearly shows  "using WaitressServer()":

C:\Users\nico\Desktop\py4web_win_1.20200829.1\py4web>py4web-start.exe run apps

██████╗ ██╗   ██╗██╗  ██╗██╗    ██╗███████╗██████╗
██╔══██╗╚██╗ ██╔╝██║  ██║██║    ██║██╔════╝██╔══██╗
██████╔╝ ╚████╔╝ ███████║██║ █╗ ██║█████╗  ██████╔╝
██╔═══╝   ╚██╔╝  ╚════██║██║███╗██║██╔══╝  ██╔══██╗
██║        ██║        ██║╚███╔███╔╝███████╗██████╔╝
╚═╝        ╚═╝        ╚═╝ ╚══╝╚══╝ ╚══════╝╚═════╝
Is still experimental...

Py4web: 1.20200829.1 on Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)]


Dashboard is at: http://127.0.0.1:8000/_dashboard
[X] loaded examples
[X] loaded myfeed
[X] loaded todo
[X] loaded _dashboard
[X] loaded _default
[X] loaded _documentation
[X] loaded _minimal
[X] loaded _scaffold
Bottle v0.12.18 server starting up (using WaitressServer())...
Listening on http://127.0.0.1:8000/
Hit Ctrl-C to quit.

Serving on http://DESKTOP-KQI2P47:8000

 

Cheers,

Nico

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[Nico Zanferrari]

New binaries built, see  https://github.com/nicozanf/py4web-pyinstaller . On MacOS, it correctly uses Tornado.

But I've found a small problem with waitress on Windows - it logs on the console many errors like this one:

ERROR:waitress:Socket error
Traceback (most recent call last):
  File "waitress\channel.py", line 144, in handle_read
  File "waitress\wasyncore.py", line 446, in recv
  File "gevent\_socket3.py", line 378, in recv
    return _socket.socket.recv(self._sock, *args)
BlockingIOError: [WinError 10035] A non-blocking socket operation could not be completed immediately

Nico

[Val K]

As windows user,  I'm happy with this https://winpython.github.io

and this https://git-scm.com/download/win ("thumbdrive edition" - works even from USB) - git-bush cli !!!

both are portable, no installation required

воскресенье, 30 августа 2020 г. в 01:14:10 UTC+3, nico...@gmail.com:

[Massimo]

I think there is value in a standalone windows package like Nico is building.

In fact I think we should be make it more prominent with links from the web page.

Nico feel free to make a PR with the links.

[Val K]

yes, of course, binaries that work out of the box is a key feature for newbies (I started with that too;)

вс, 30 авг. 2020 г. в 04:22, Massimo <massimo....@gmail.com>:

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[Nico Zanferrari]

Thank you Val, I didn't know   https://winpython.github.io - it could be useful in some situations!

@Massimo: I've made the PR , and I've also filed the Issue #275 for the console errors.

Nico

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