Safari ignores proxy settings for AJAX requests?

I'm using Safari 4 on Mac OS X 10.5.7.
When I configure Safari's proxy settings (which redirect to System Preferences -> Network -> Advanced -> Proxies), all my page requests go through the proxy I configured, except for AJAX requests.
I configured an intercepting proxy (burp suite) to verify this, and indeed, AJAX requests are not being sent to the proxy. I double checked the exact same page on Firefox 3.5 on the same Mac with the same proxy being configured, and in this case the AJAX requests do go via the proxy.
For Safari, I configured the "Web Proxy (HTTP)" and "Secure Web Proxy (HTTPS). Is there anything else I need to do? Is this a bug in Safari?
Thanks in advance for all help.

I'm seeing the same problem. I use privoxy, a local security/privacy/ad-blocking proxy that lives on my computer. Firefox always sends its requests through the proxy, but Safari sometimes ignores the proxy settings. Vienna, my RSS reader, stops going through the proxy when Safari stops doing it. A restart fixes the problem for a while, but eventually the ads start showing up in Safari and Vienna.
I didn't start seeing this problem until Safari 4. I'm currently using the most up-to-date version of Safari, 4.0.3, with Mac OS X 10.5.8 and all other updates as of 12 Sep 2009. Privoxy is version 3.0.10, not the very latest, but it's working.

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