Version:           4.6.3 (using KDE 4.6.3) 
OS:                Linux

When browsing with Konqueror, the main HTTP request for that page (basically, what you see in the URL bar) is made twice. This happens for both GET and POST requests.

Notably, AJAX requests are NOT doubled, only regular requests. In addition, images on the page, external Javascript, stylesheets, etc, do not appear to be double loaded unless they are navigated to directly.

Reproducible: Always

Steps to Reproduce:
1. Open any webpage in Konqueror
2. Observe doubled HTTP request

Actual Results:  
Main HTTP request for the webpage is performed twice.

Expected Results:  
Main HTTP request for the webpage is performed only once.

In general usage, this bug is often difficult to notice. However, due to the fact that this also affects POST requests, the consequences can be quite bad. Double posting in forums, double sending emails, double buying things online... Even this bug report will probably get filed twice, as I'm filing it with Konqueror 4.6.3, note that I personally only filed it once.

Previously I was using 4.6.1 and I never observed this bug there. I skipped 4.6.2, so I'm not sure if it was present there, but it was definitely a regression somewhere between 4.6.1 and 4.6.3.

This is probably easiest to observe if you hit a server for which you're watching the logs, but you could probably tcpdump the traffic as well.