Some urls failing with HTTP_STATUS_BAD_REQUEST 400
When entering those URLs into a browser, they redirect.
Release : Any UIM release
Component : UIM - URL_RESPONSE
In a browser, it is hard to tell how redirects are triggered. The best way to test problem URLs is the wget command. (curl command would be very effective as well.) wget command can be found in the repositories for nearly any Linux distribution, and can get a Windows version here:
wget command by default shows every step of the web transaction, calling out all of the redirects and such. It has made some cause of URL monitoring issues nice and obvious even though make understand what was broken when just checked with a browser.