Update to version 11.0.4. Read https://github.com/kataras/iris/blob/master/HISTORY.md#fr-09-november-2018--v1104

Former-commit-id: 2c2c32afe31fe94543d145ab8c8475d7b4392ff1

_examples/experimental-handlers/cors/simple/main.go

@@ -44,5 +44,11 @@ func main() {
 		})
 	}
 
-	app.Run(iris.Addr(":80"))
+	// iris.WithoutPathCorrectionRedirection | iris#Configuration.DisablePathCorrectionRedirection:
+	// CORS needs the allow origin headers in the redirect response as well, we have a solution for this:
+	// If you use iris >= v11.0.4 then add the `app.Run(..., iris.WithoutPathCorrectionRedirection)`
+	// on the server side if you wish
+	// to directly fire the handler instead of redirection (which is the default behavior)
+	// on request paths like "/v1/mailer/" when "/v1/mailer" route handler is registered.
+	app.Run(iris.Addr(":80"), iris.WithoutPathCorrectionRedirection)
 }