Tracing the web request invoked using HttpClientHelper Class

I am having WebAPI service hosted in IIS. I am invoking that service from asp.net application using HttpClientHelper Class to receive the response.

 

I am using fiddler to capture the request but service invoked using HttpClientHelper is not captured in fiddler. Is there any other way to capture the service invoked using httpclienthelper class? or Do I need to do any setting in fiddler? thanks in advance.