In my understanding, connecting to a local host may not always work. This also happened to me. As a related article states that
Allow the .NET Framework to automatically connect to Fiddler, run Fiddler before running the .NET application, and
, localhost, localhost , ( , wirehark netmon ..), localhost. localhost URL-, U ,
- Fiddler , -
- ipv4.fiddler
- - .net - .net.
- localhost. , -, .
e.g. http://localhost/api may or may not appear in fiddler but http://mymachine/api will always be captured.