Re: Django 1.5 runserver hangs in Chrome

[Nikolas Stevenson-Molnar]

After a lot of dead ends, I finally found the problem! The cause is the
switch to using CompatibleStreamingHttpResponse in the
django.views.static.server view. Previously, the view simply read the
whole file into memory and returned a regular HTTP response. The
StreamingHTTPResponse class uses the file iterator to return data, which
in turn returns one line per iteration. I'm not at all sure why, but
this seams to cause a problem when requesting many files at once (e.g.,
Chrome).

In order to verify that this was the problem, I solved the issue by
adding a *file_chunk_iterator *function (yields 1024 bytes per
iteration, rather than one line like the standard Python file iterator),
and changing the response in the serve view from this:

response = CompatibleStreamingHttpResponse(open(fullpath, 'rb'),
content_type=mimetype)

to this:

response =
CompatibleStreamingHttpResponse(file_chunk_iterator(open(fullpath,
'rb')), content_type=mimetype)

The iterator function looks like this:

def file_chunk_iterator(f, size=1024):
while True:
chunk = f.read(size)
if chunk:
yield chunk
else:
return

On 7/3/2013 5:39 PM, Nikolas Stevenson-Molnar wrote:
> I've just updated to Django 1.5 and am running into a problem when
> using Chrome with the Django devlopment server (and staticfiles). One
> particular page which loads a lot of static content /consistently/
> hangs in Chrome (works fine in Firefox). This seems similar to two
> resolved issues: https://code.djangoproject.com/ticket/16099 and
> https://code.djangoproject.com/ticket/18336. Except that I've waited
> several minutes and the resources haven't finished loading. I've
> increased request_queue_size as suggested in the second issue (first
> to 10, then 20, then 50) with no change.
>
> I'd chalk this up entirely as a Chrome problem, except that if I
> switch back to Django 1.4 (changing nothing else), everything goes
> back to working fine. So what changed about runserver in Django 1.5
> that might cause this? And more importantly, how do I get around it?
> I'm running everything on Windows 7 with Django 1.5.1 and the latest
> version of Chrome.
>
> Thanks,
> _Nik

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Re: Django 1.5 runserver hangs in Chrome

[Nikolas Stevenson-Molnar]

Hi Sven,

Thanks for the suggestion. Unfortunately, this didn't resolve the issue
for me. Chrom is still hanging on that page. It loads most of the
resources, then hangs indefinitely while requesting several images.

If I close the tab, I get a stack trace in the Django log (connection
aborted) which shows the last call to be to socket.sendall(). It's
bizarre; what is going on?  I can load all those images fine in a
separate tab, but loading them with the page creates problems...

_Nik

On 7/8/2013 4:00 AM, Sven Bröckling wrote:
> Hi,
>
> Chrome sometimes does really strange things. I use chrome with a
> disabled cache for development (Open Developer Tools, click on the
> settings menu, first option) which resolves this kind of problems for me.
>
> Regards
>   Sven
>
>> I can confirm this issue. Exactly the same problem here.
>> Also, while Chrome is spinning, I can open Firefox and load pages
>> (including the problem page) just fine. So it's not that the server
>> is overloaded or anything like that...
>

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Re: Django 1.5 runserver hangs in Chrome

[Larry Martell]

On Mon, Jul 8, 2013 at 9:16 AM, François Schiettecatte
 wrote:
> Its the little gear at the bottom right, took me a while to find it.

Got it! Thanks!


> On Jul 8, 2013, at 11:10 AM, Larry Martell  wrote:
>
>> On Mon, Jul 8, 2013 at 5:00 AM, Sven Bröckling  wrote:
>>> Hi,
>>>
>>> Chrome sometimes does really strange things. I use chrome with a disabled
>>> cache for development (Open Developer Tools, click on the settings menu,
>>> first option) which resolves this kind of problems for me.
>>
>> I'm frequently emptying my cache, so this would help me a lot. But I
>> can't find the setting menu when I open the Developer Tools - where is
>> that?
>>
>> Thanks!
>> -larry
>>
 I can confirm this issue. Exactly the same problem here.
Also, while Chrome is spinning, I can open Firefox and load pages
(including the problem page) just fine. So it's not that the server
is overloaded or anything like that...
>>>
>>>
>>> --
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>>>
>>>
>>
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>>
>>
>
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>
>

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Re: Django 1.5 runserver hangs in Chrome

[François Schiettecatte]

Its the little gear at the bottom right, took me a while to find it.

F.

On Jul 8, 2013, at 11:10 AM, Larry Martell  wrote:

> On Mon, Jul 8, 2013 at 5:00 AM, Sven Bröckling  wrote:
>> Hi,
>> 
>> Chrome sometimes does really strange things. I use chrome with a disabled
>> cache for development (Open Developer Tools, click on the settings menu,
>> first option) which resolves this kind of problems for me.
> 
> I'm frequently emptying my cache, so this would help me a lot. But I
> can't find the setting menu when I open the Developer Tools - where is
> that?
> 
> Thanks!
> -larry
> 
>>> I can confirm this issue. Exactly the same problem here.
>>>Also, while Chrome is spinning, I can open Firefox and load pages
>>>(including the problem page) just fine. So it's not that the server
>>>is overloaded or anything like that...
>> 
>> 
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Django users" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to django-users+unsubscr...@googlegroups.com.
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>> Visit this group at http://groups.google.com/group/django-users.
>> For more options, visit https://groups.google.com/groups/opt_out.
>> 
>> 
> 
> -- 
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> 
> 

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Re: Django 1.5 runserver hangs in Chrome

[Larry Martell]

On Mon, Jul 8, 2013 at 5:00 AM, Sven Bröckling  wrote:
> Hi,
>
> Chrome sometimes does really strange things. I use chrome with a disabled
> cache for development (Open Developer Tools, click on the settings menu,
> first option) which resolves this kind of problems for me.

I'm frequently emptying my cache, so this would help me a lot. But I
can't find the setting menu when I open the Developer Tools - where is
that?

Thanks!
-larry

>> I can confirm this issue. Exactly the same problem here.
>> Also, while Chrome is spinning, I can open Firefox and load pages
>> (including the problem page) just fine. So it's not that the server
>> is overloaded or anything like that...
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to django-users+unsubscr...@googlegroups.com.
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> Visit this group at http://groups.google.com/group/django-users.
> For more options, visit https://groups.google.com/groups/opt_out.
>
>

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Re: Django 1.5 runserver hangs in Chrome

[Sven Bröckling]

Hi,

Chrome sometimes does really strange things. I use chrome with a 
disabled cache for development (Open Developer Tools, click on the 
settings menu, first option) which resolves this kind of problems for me.


Regards
  Sven


I can confirm this issue. Exactly the same problem here.
Also, while Chrome is spinning, I can open Firefox and load pages
(including the problem page) just fine. So it's not that the server
is overloaded or anything like that...


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users" group.
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Re: Django 1.5 runserver hangs in Chrome

[eXt]

I can confirm this issue. Exactly the same problem here.

W dniu czwartek, 4 lipca 2013 02:52:58 UTC+2 użytkownik Nikolas 
Stevenson-Molnar napisał:
>
>  Also, while Chrome is spinning, I can open Firefox and load pages 
> (including the problem page) just fine. So it's not that the server is 
> overloaded or anything like that...
>
> _Nik
>
> On 7/3/2013 5:39 PM, Nikolas Stevenson-Molnar wrote:
>  
> I've just updated to Django 1.5 and am running into a problem when using 
> Chrome with the Django devlopment server (and staticfiles). One particular 
> page which loads a lot of static content *consistently* hangs in Chrome 
> (works fine in Firefox). This seems similar to two resolved issues: 
> https://code.djangoproject.com/ticket/16099 and 
> https://code.djangoproject.com/ticket/18336. Except that I've waited 
> several minutes and the resources haven't finished loading. I've increased 
> request_queue_size as suggested in the second issue (first to 10, then 20, 
> then 50) with no change.
>
> I'd chalk this up entirely as a Chrome problem, except that if I switch 
> back to Django 1.4 (changing nothing else), everything goes back to working 
> fine. So what changed about runserver in Django 1.5 that might cause this? 
> And more importantly, how do I get around it? I'm running everything on 
> Windows 7 with Django 1.5.1 and the latest version of Chrome.
>
> Thanks,
> _Nik
>
>
> 

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Re: Django 1.5 runserver hangs in Chrome

[Nikolas Stevenson-Molnar]

Also, while Chrome is spinning, I can open Firefox and load pages
(including the problem page) just fine. So it's not that the server is
overloaded or anything like that...

_Nik

On 7/3/2013 5:39 PM, Nikolas Stevenson-Molnar wrote:
> I've just updated to Django 1.5 and am running into a problem when
> using Chrome with the Django devlopment server (and staticfiles). One
> particular page which loads a lot of static content /consistently/
> hangs in Chrome (works fine in Firefox). This seems similar to two
> resolved issues: https://code.djangoproject.com/ticket/16099 and
> https://code.djangoproject.com/ticket/18336. Except that I've waited
> several minutes and the resources haven't finished loading. I've
> increased request_queue_size as suggested in the second issue (first
> to 10, then 20, then 50) with no change.
>
> I'd chalk this up entirely as a Chrome problem, except that if I
> switch back to Django 1.4 (changing nothing else), everything goes
> back to working fine. So what changed about runserver in Django 1.5
> that might cause this? And more importantly, how do I get around it?
> I'm running everything on Windows 7 with Django 1.5.1 and the latest
> version of Chrome.
>
> Thanks,
> _Nik

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Django 1.5 runserver hangs in Chrome

[Nikolas Stevenson-Molnar]

I've just updated to Django 1.5 and am running into a problem when using
Chrome with the Django devlopment server (and staticfiles). One
particular page which loads a lot of static content /consistently/ hangs
in Chrome (works fine in Firefox). This seems similar to two resolved
issues: https://code.djangoproject.com/ticket/16099 and
https://code.djangoproject.com/ticket/18336. Except that I've waited
several minutes and the resources haven't finished loading. I've
increased request_queue_size as suggested in the second issue (first to
10, then 20, then 50) with no change.

I'd chalk this up entirely as a Chrome problem, except that if I switch
back to Django 1.4 (changing nothing else), everything goes back to
working fine. So what changed about runserver in Django 1.5 that might
cause this? And more importantly, how do I get around it? I'm running
everything on Windows 7 with Django 1.5.1 and the latest version of Chrome.

Thanks,
_Nik

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