Version:           4.7.2 (using KDE 4.7.2) 
OS:                Linux

It seems Akregator does not use correctly the proxy settings configured in KDE. The main consequence is that external URLs are not loaded (the feed icon turns red and the feed is not updated). 

I experienced the same problem with Rekonq which then says :

    ERROR

    The requested URL could not be retrieved

    While trying to retrieve the URL: /

    The following error was encountered:

    Invalid URL
    Some aspect of the requested URL is incorrect. Possible problems:

    Missing or incorrect access protocol (should be `http://'' or similar)
    Missing hostname
    Illegal double-escape in the URL-Path
    Illegal character in hostname; underscores are not allowed
    Your cache administrator is cct.help@vd.ch. 
    Generated Wed, 26 Oct 2011 11:20:55 GMT by proxy1.vd.ch (squid/2.5.STABLE3)

I also tried with Chrome 15 (which uses the KDE proxy settings), but it works fine there.

It worked fine with Akregator v1.6.6 (KDE 4.6.5).

I tried the following configurations :

1) proxy configuration with URL : 

    $ cat .kde/share/config/kioslaverc
    DoNotTrack=false
    PersistentProxyConnection=true

    [$Version]
    update_info=kioslave.upd:kde2.2/r1,kioslave.upd:kde2.2/r2,kioslave.upd:kde2.2/r3

    [Proxy Settings]
    AuthMode=0
    NoProxyFor=
    Proxy Config Script=http://proxy.vd.ch/proxy-conf/internet.pac
    ProxyType=2
    ReversedException=false
    ftpProxy=
    httpProxy=
    httpsProxy=

=> Akregator/Rekonq : exernal URLs are *not* loaded, but local ones are.
   Chrome 15 : both external and local URLs are loaded.

2) manual proxy configuration (with checkbox 'use proxy only for entries in this list' unchecked) : 

    $ cat .kde/share/config/kioslaverc
    DoNotTrack=false
    PersistentProxyConnection=true

    [$Version]
    update_info=kioslave.upd:kde2.2/r1,kioslave.upd:kde2.2/r2,kioslave.upd:kde2.2/r3

    [Proxy Settings]
    AuthMode=0
    NoProxyFor=etat-de-vaud.ch,vd.ch,localhost
    Proxy Config Script=http://proxy.vd.ch/proxy-conf/internet.pac
    ProxyType=1
    ReversedException=false
    ftpProxy=http://proxy.vd.ch:8080
    httpProxy=http://proxy.vd.ch:8080
    httpsProxy=http://proxy.vd.ch:8080

=> Akregator/Rekonq : exernal URLs are loaded, but local ones are *not*.
   Chrome 15 : exernal URLs are loaded, but local ones are *not*.

3) manual proxy configuration (with checkbox 'use proxy only for entries in this list' checked) : 

    $ cat .kde/share/config/kioslaverc
    DoNotTrack=false
    PersistentProxyConnection=true

    [$Version]
    update_info=kioslave.upd:kde2.2/r1,kioslave.upd:kde2.2/r2,kioslave.upd:kde2.2/r3

    [Proxy Settings]
    AuthMode=0
    NoProxyFor=etat-de-vaud.ch,vd.ch,localhost
    Proxy Config Script=
    ProxyType=1
    ReversedException=true
    ftpProxy=http://proxy.vd.ch:8080
    httpProxy=http://proxy.vd.ch:8080
    httpsProxy=http://proxy.vd.ch:8080

=> Akregator/Rekonq : exernal URLs are *not* loaded, but local ones are.
   Chrome 15 : exernal URLs are *not* loaded, but local ones are.

I restarted Akregator after each settings change.

Finally, it seems that https URLs work fine with Rekonq with configuration #1 (but not http ones). I couldn't find any https feeds to check this behavior with Akregator.

Reproducible: Always

Steps to Reproduce:
1) configure a http proxy in KDE System Settings
2) start Akregator
3) try to refresh or add a feed (for instance http://lwn.net/headlines/newrss)

Actual Results:  
The feed's icon turns red after a couple of secondes, and the feed isn't refreshed.

Expected Results:  
The feed is refreshed and new items show up.

OS: Linux (i686) release 3.0.0-12-generic-pae
Compiler: gcc