Watch HTTP traffic with Katana

Question

I'm launching OWIN/Katana from within MsTest. I'm using the Web API HttpClient to create requests and I'm successfully receiving replies.

However, Fiddler doesn't see the traffic. I've tried a number of techniques to make Fiddler see the traffic:

• Changed the host address to localhost. with an explicit period at the end
• Changed the host address to localhost.fiddler
• Changed the host address to match the machine name.

In each case the request/response is working, but still Fiddler does not see the traffic.

Perhaps in the end I should not try Fiddler. Is there another way to capture the raw HTTP traffic?

Answer 1

If you changed the request URL's hostname to localhost.fiddler and it succeeded, that means, by definition that the traffic went through Fiddler. If you didn't see it in Fiddler, that means you have a filter set. In Fiddler, click Help > Troubleshoot to unhide hidden traffic. Look at the Sessions' Comments column to see which filter you have set that is hiding the traffic.