Thanks for the inputs.
I'm able to see the URI in BT splittings but is it the same URI from of arguments
getInputStream()? if yes then it should be reported something like https://xxx.yyy.zzzz.com:3321/webservices/rest/XX_...
See the screenshot attached of BT result.
Depending on how you set up the URI Pattern measure, it may capture just the last part of the URI, ignoring host and port (in the measure definition, there is a light bulb button you can click to test how different values will get reported).
However, if you are interested in just one call, why are you splitting the BT? Try instead filtering by the URI Pattern of your web service call.
In attempt to fetch the URI pattern, you have placed the argument sensor on the generic class HttpUrlConnection -- this should be avoided. Good news is that you can readily extract the URL pattern by creating a web request URI pattern value instead of putting sensor. Or open the Web Requests dashlet.
Let me know if you need help with regex.