Internal error: proxy: error reading status line from remote server localhost

[Nicolas]

Hello,

I use Apache to redirect the APE calls from port 80 to another port
(because other ports are often blocked). However, I now get these
errors very often:

[Sun May 13 19:43:16 2012] [error] [client 94.254.38.238]
(20014)Internal error: proxy: error reading status line from remote
server localhost, referer:
http://11.ape.xxxx.com/?[{%22cmd%22:%22script%22,%22params%22:{%22domain%22:%22xxxx.com%22,%22scripts%22:[%22http://xxxx.com/ape-jsf/Source/mootools-core_v2.js%22,%22http://xxxx.com/ape-jsf/Source/Core/APE.js%22,%22http://xxxx.com/ape-jsf/Source/Core/Events.js%22,%22http://xxxx.com/ape-jsf/Source/Core/Core.js%22,%22http://xxxx.com/ape-jsf/Source/Pipe/Pipe.js%22,%22http://xxxx.com/ape-jsf/Source/Pipe/PipeSingle.js%22,%22http://xxxx.com/ape-jsf/Source/Request/Request.js%22,%22http://xxxx.com/ape-jsf/Source/Request/Request.Stack.js%22,%22http://xxxx.com/ape-jsf/Source/Request/Request.CycledStack.js%22,%22http://xxxx.com/ape-jsf/Source/Transport/Transport.longPolling.js%22,%22http://xxxx.com/ape-jsf/Source/Core/Utility.js%22,%22http://xxxx.com/ape-jsf/Source/Core/JSON.js%22,%22http://xxxx.com/ape-jsf/Source/Core/Session.js%22]}}]

Any idea why I get these errors?

[Paizo]

I have the same issue. I successful tried to proxy ape https requests using Apache instead of stunnel, and it is much better.
The only annoying thing is this error while loading ape scripts, looks like there is a bug in httpd resolved for version 2.2.3 but i don't wanna upgrade to an unstable version under centos.

anyone have hints?