Configuring Fiddler to capture sessions between two local IISExpress sites?

Question

Is there a way to configure Fiddler 4.6 to capture traffic from one instance of IISExpress running on my Dev machine to a second IISExpress instance running on the same Dev machine?

I am using VS 2017 with one web site that is accessing some Web API methods on a second site running on another instance of IISExpress.

All of the browser to server traffic is captured fine, but I need to go from site to site to test some API calls.

Answer 1

The question is not so clear, but if you wants to communicate one IIS with another, you need to add a proxy like in the example:

var httpClientHandler = new HttpClientHandler
                        {
                            Proxy = new WebProxy("http://localhost:8888", false),
                            UseProxy = true
                        }

For more info take a look at the Fiddler docs