You should probably debug where does the problem appear. Are you entering the contains condition and the internal if statement? Is some session flag causing the issue, or is there an error that can be caught when some of the utils methods are executed?
As a side note, this forum is for topics related to the Fiddler Everywhere application. The Fiddler Classic and FiddlerCore forums are located here: https://www.telerik.com/forums/fiddler
I use FiddlerCore4.dll to capture the url and return data for that url. The problem occurs as follows: domain/api/auth?datavery=xxx, the fiddler software receives it and shows the messendbox, but domain/miapi/miapi/api.php/Check?data=xxxx the software can't catch the url above. YES when it's related that the url has a .php extension. How do I handle it?