TraceListener in OWIN Self Hosting

Question

I am using Microsoft.Owin.Hosting to host the following, very simple web app.

Here is the call to start it:

Answer 1

I had the same issue, I was self hosting 4 instances in one process and for each request was getting 4 lots of messages traced to console.

I simply removed the TraceListener instance

Trace.Listeners.Remove("HostingTraceListener")

"HostingTraceListener" is defined in the owin source code so I guess could change - http://katanaproject.codeplex.com/SourceControl/latest#src/Microsoft.Owin.Hosting/Engine/HostingEngine.cs

I did this after

WebApp.Start(...