I also encountered that issue too and I was not alone if I remember  
well.
The message was from 20th August, subject : [qooxdoo-devel]  
qx.io.remote.Rpc timeout question

On Sep 4, 2009, at 07:32 , Petr Kobalíček wrote:

> This is still not fixed?
>
> I has this issue while I started with qooxdoo and it's about 1.5 year.
> I had to write own transport layer (maybe it's here in mailing list
> somewhere). The problem is exception thrown in event handler (as Matt
> wrote).
>
> Is there a bug report for this issue? I can create if isn't, but it's
> probably very known problem.
>
> Best regards
> - Petr
>
> 2009/9/3 Matthew Gregory <[email protected]>:
>> The most common cause of this is an error in the callback function/ 
>> event
>> handler. Can you check your code, or try adding some try catch  
>> blocks?
>>
>> function handler()
>> {
>>   try
>>   {
>>     <ORIGINAL CODE>
>>   }
>>   catch (e)
>>   {
>>     alert("this is why!");
>>     alert(e);
>>   }
>> }
>>
>> HTH,
>> Matt
>>
>> Ian Horst wrote:
>>> I'm back to development in qooxdoo. And struggle to figure out why  
>>> my
>>> last 2 out of 5 requests in queue time out. FF3.5.2, firebug  
>>> disabled
>>> to confirm it doesn't affect known issue with xmlhttprequest.
>>>
>>> Qooxdoo trunk 19987
>>>
>>> When I enable firebug, I can see that xmlhttprequests do take less
>>> than 3 seconds to complete.
>>>
>>> Any idea why it happens?
>>>
>>>
>>> 002451 qx.core.Init: Finalize runtime: 30ms
>>> 002720 State: sending
>>> 002721 State: configured => sending
>>> 002721 qx.io.remote.RequestQueue[2b]: ActiveCount: 1
>>> 002721 qx.event.type.Event[2a]: State: sending
>>> 002722 State: receiving
>>> 002722 State: sending => receiving
>>> 002722 qx.event.type.Event[2a]: State: receiving
>>> 002722 State: completed
>>> 002723 State: receiving => completed
>>> 002723 Returning content for responseType: application/json
>>> 002724 qx.io.remote.RequestQueue[2b]: ActiveCount: 0
>>> 002724 qx.event.type.Event[2a]: State: completed
>>> 002728 qx.io.remote.RequestQueue[2b]: Progress: 2/2
>>> 002730 State: sending
>>> 002730 State: configured => sending
>>> 002730 qx.io.remote.RequestQueue[2b]: ActiveCount: 1
>>> 002730 qx.event.type.Event[2t]: State: sending
>>> 002731 State: receiving
>>> 002731 State: sending => receiving
>>> 002731 qx.event.type.Event[2t]: State: receiving
>>> 002731 State: completed
>>> 002732 State: receiving => completed
>>> 002732 Returning content for responseType: application/json
>>> 002732 qx.io.remote.RequestQueue[2b]: ActiveCount: 0
>>> 002732 qx.event.type.Event[2t]: State: completed
>>> 002734 qx.io.remote.RequestQueue[2b]: Progress: 1/1
>>> 002780 State: sending
>>> 002780 State: configured => sending
>>> 002780 qx.io.remote.RequestQueue[2b]: ActiveCount: 1
>>> 002780 qx.html.Element[2p]: State: sending
>>> 002785 State: receiving
>>> 002785 State: sending => receiving
>>> 002785 qx.html.Element[2p]: State: receiving
>>> 002786 State: completed
>>> 002786 State: receiving => completed
>>> 002786 Returning content for responseType: application/json
>>> 002788 qx.io.remote.RequestQueue[2b]: ActiveCount: 0
>>> 002788 qx.html.Element[2p]: State: completed
>>> 008763 qx.io.remote.Request[4k6]: State: queued
>>> 008763 qx.io.remote.RequestQueue[2b]: Progress: 1/2
>>> 008763 qx.io.remote.RequestQueue[2b]: Progress: 2/2
>>> 008764 qx.io.remote.Exchange[4k7]: Using implementation:
>>> qx.io.remote.transport.XmlHttp
>>> 008766 qx.io.remote.transport.XmlHttp[4k8]: State: configured
>>> 008770 qx.io.remote.Request[4ki]: State: queued
>>> 008771 qx.io.remote.RequestQueue[2b]: Progress: 2/3
>>> 008771 qx.io.remote.RequestQueue[2b]: Progress: 3/3
>>> 008771 qx.io.remote.Exchange[4kj]: Using implementation:
>>> qx.io.remote.transport.XmlHttp
>>> 008773 qx.io.remote.transport.XmlHttp[4kk]: State: configured
>>> 009407 qx.io.remote.RequestQueue[2b]: Progress: 2/2
>>> 010837 qx.io.remote.transport.XmlHttp[4k8]: State: sending
>>> 010840 qx.io.remote.Exchange[4k7]: State: configured => sending
>>> 010841 qx.io.remote.RequestQueue[2b]: ActiveCount: 1
>>> 010842 qx.io.remote.Request[4k6]: State: sending
>>> 010847 qx.io.remote.transport.XmlHttp[4k8]: State: receiving
>>> 010848 qx.io.remote.Exchange[4k7]: State: sending => receiving
>>> 010850 qx.io.remote.Request[4k6]: State: receiving
>>> 010852 qx.io.remote.transport.XmlHttp[4k8]: State: completed
>>> 010853 qx.io.remote.Exchange[4k7]: State: receiving => completed
>>> 010855 qx.io.remote.transport.XmlHttp[4k8]: Returning content for
>>> responseType: application/json
>>> 010857 qx.io.remote.RequestQueue[2b]: ActiveCount: 0
>>> 010858 qx.io.remote.Request[4k6]: State: completed
>>> 010870 qx.io.remote.transport.XmlHttp[4kk]: State: sending
>>> 010871 qx.io.remote.Exchange[4kj]: State: configured => sending
>>> 010873 qx.io.remote.RequestQueue[2b]: ActiveCount: 1
>>> 010874 qx.io.remote.Request[4ki]: State: sending
>>> 010877 qx.io.remote.transport.XmlHttp[4kk]: State: receiving
>>> 010878 qx.io.remote.Exchange[4kj]: State: sending => receiving
>>> 010880 qx.io.remote.Request[4ki]: State: receiving
>>> 010882 qx.io.remote.transport.XmlHttp[4kk]: State: completed
>>> 010884 qx.io.remote.Exchange[4kj]: State: receiving => completed
>>> 010886 qx.io.remote.transport.XmlHttp[4kk]: Returning content for
>>> responseType: application/json
>>> 010887 qx.io.remote.RequestQueue[2b]: ActiveCount: 0
>>> 010889 qx.io.remote.Request[4ki]: State: completed
>>> 013803 qx.io.remote.RequestQueue[2b]: Timeout: transport 4kj
>>> 013805 qx.io.remote.RequestQueue[2b]: 5032ms > 5000ms
>>> 013806 qx.io.remote.Exchange[4kj]: Timeout: implementation 4kk
>>> 013808 qx.io.remote.transport.XmlHttp[4kk]: Timeout...
>>> 013810 qx.io.remote.transport.XmlHttp[4kk]: State: timeout
>>> 013812 qx.io.remote.Exchange[4kj]: State: completed => timeout
>>> 013814 qx.io.remote.RequestQueue[2b]: ActiveCount: -1
>>> 013816 qx.io.remote.Request[4ki]: State: timeout
>>> 013819 qx.io.remote.RequestQueue[2b]: Progress: 1/1
>>> 013821 qx.io.remote.RequestQueue[2b]: Timeout: transport 4k7
>>> 013822 qx.io.remote.RequestQueue[2b]: 5039ms > 5000ms
>>> 013824 qx.io.remote.Exchange[4k7]: Timeout: implementation 4k8
>>> 013826 qx.io.remote.transport.XmlHttp[4k8]: Timeout...
>>> 013827 qx.io.remote.transport.XmlHttp[4k8]: State: timeout
>>> 013829 qx.io.remote.Exchange[4k7]: State: completed => timeout
>>> 013830 qx.io.remote.RequestQueue[2b]: ActiveCount: -2
>>> 013832 qx.io.remote.Request[4k6]: State: timeout
>>> 013835 qx.io.remote.RequestQueue[2b]: Progress: 0/0
>>>
>>>
>>> ---
>>> Ian Horst
>>>
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>>
>>
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>>
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