[Twisted-web] Asynchronous responses example from documentation -- why import time??

[Jason Harrison]

I may have found it, by adding the assignment "isLeaf = True" to the
DelayedResponse class it also appears to work.
However many of the examples in the documentation do not assign "isLeaf =
True".
Would this also explain the difference in behaviour?

-Jason

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On Wed, Aug 8, 2018 at 1:19 PM, Jason Harrison <drjasonharrison at gmail.com>
wrote:

>
> On Wed, 8 Aug 2018 at 11:58 AM  Jean-Paul Calderone <
>> exarkun at twistedmatrix.com> wrote:
>
> One possible explanation is that it has nothing to do with import time per
>> se.  Instead, *any* change to your source file would have fixed the
>> problem.  This could be because you had "stale" pyc files lying around
>> (cached bytecode the interpreter *thought* was up-to-date with your source
>> but was actually outdated).  It could also be that your server process was
>> left running and was still using your old code.  Then, for some reason,
>> after you added the import time your server got the new version of the
>> code
>> (perhaps you're relying on an auto-reloader and it missed a change, for
>> example, or you just forgot to restart the server yourself).
>>
>> import time itself is definitely not a requirement for arbitrary Twisted
>> Web-based programs to return a response other than 404.
>>
>> Jean-Paul
>>
>>
> Hi Jean-Paul,
>
> I made many changes to the example in order to get it to work. So perhaps
> it's a caching issue, but I can't find any caches. Here's what I'm
> developing on:
>
> - OSX 10.13.6
> - I'm using Sublime text, no auto reloaders afaik
> - python3 --version :  Python 3.7.0
> - pip3 list:
>
> Package        Version
> -------------- -------
> attrs          18.1.0
> Automat        0.7.0
> constantly     15.1.0
> dlib           19.15.0
> hyperlink      18.0.0
> idna           2.7
> incremental    17.5.0
> numpy          1.15.0
> pip            18.0
> PyHamcrest     1.9.0
> setuptools     39.2.0
> six            1.11.0
> Twisted        18.7.0
> wheel          0.31.1
> zope.interface 4.5.0
>
> - running the server using ./asynchronous.py
> - I don't have any .pyc files in the script directory, possibly because I
> "chmod +x" the source file and included the #! at the top
> - I added logging and while the main program (setup of Twisted reactor)
> logged, the DelayedResource class did not
> - I added parts of the example at https://twistedmatrix.com/
> documents/current/web/howto/web-in-60/dynamic-content.html
> - I changed "resource = DelayedResource()" to "resource = ClockPage()"
> - I changed the render_GET handler to return the Clock page example output
> - etc until I stopped getting a 404
> - I restarted the server many many times
>
> I removed and backed out every change until I got a 404, concluding it was
> the "import time" line.
> Any other ideas?
>
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