Comment 9 for bug 545134

On Windows and Mac OS X this same issue exists with some programs, but (probably) not in programs installed with the OS by default. I guess there needs to be a test for at least all applications in main to make sure they use the proxy settings...

@MPT: there is not one network library, but several, and maybe some applications even implement (what they need from) HTTP themselves. I'm pretty sure that applications which use libsoup (which includes all applications that use gvfs for HTTP/HTTPS) or libcurl or Python's urllib/urllib2 modules or a similar widely-used high-level library will already work correctly.

But I think that the real problem is that the settings in GNOME only set the proxy for GNOME applications.