url_response: HTTP_STATUS_BAD_REQUEST 400

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)
• CA Unified Infrastructure Management On-Premise (Nimsoft / UIM)
• CA Unified Infrastructure Management SaaS (Nimsoft / UIM)

Issue/Introduction

Some urls are failing with HTTP_STATUS_BAD_REQUEST 400

Environment

• Release: Any UIM release
• Component: UIM - URL_RESPONSE

Cause

• When entering those URLs into a browser, they redirect.

Resolution

Some websites use HTML or JavaScript to trigger redirects, and these do not work with the url_response probe.

If the url_response probe gets a redirect code as part of the HTTP response, it will automatically follow the redirect properly. If the redirect is embedded in the response content, the url_response probe knows nothing about it.

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:

http://gnuwin32.sourceforge.net/packages/wget.htm 
 
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 you may not understand what was broken when just checked with a browser.