more stuff; insight: use proxy for upstream queries

middleware/exchange.go

@@ -2,13 +2,7 @@ package middleware
 
 import "github.com/miekg/dns"
 
-// Exchang sends message m to the server.
-// TODO(miek): optionally it can do retries of other silly stuff.
 func Exchange(c *dns.Client, m *dns.Msg, server string) (*dns.Msg, error) {
 	r, _, err := c.Exchange(m, server)
 	return r, err
 }
-
-// Lookup functions, ala
-// LookupHost
-// LookupCNAME