A few comments, slight tweaks

caddy/caddy.go

@@ -39,7 +39,7 @@ var (
 	// The name and version of the application.
 	AppName, AppVersion string
 
-	// If true, initialization will not show any output.
+	// If true, initialization will not show any informative output.
 	Quiet bool
 
 	// DefaultInput is the default configuration to use when config input is empty or missing.

caddy/config.go

@@ -278,6 +278,7 @@ func arrangeBindings(allConfigs []server.Config) (Group, error) {
 func resolveAddr(conf server.Config) (resolvAddr *net.TCPAddr, warnErr error, fatalErr error) {
 	bindHost := conf.BindHost
 
+	// TODO: Do we even need the port? Maybe we just need to look up the host.
 	resolvAddr, warnErr = net.ResolveTCPAddr("tcp", net.JoinHostPort(bindHost, conf.Port))
 	if warnErr != nil {
 		// Most likely the host lookup failed or the port is unknown

caddy/helpers.go

@@ -16,9 +16,9 @@ func init() {
 	letsencrypt.OnChange = func() error { return Restart(nil) }
 }
 
-// isLocalhost returns true if the string looks explicitly like a localhost address.
-func isLocalhost(s string) bool {
-	return s == "localhost" || s == "::1" || strings.HasPrefix(s, "127.")
+// isLocalhost returns true if host looks explicitly like a localhost address.
+func isLocalhost(host string) bool {
+	return host == "localhost" || host == "::1" || strings.HasPrefix(host, "127.")
 }
 
 // checkFdlimit issues a warning if the OS max file descriptors is below a recommended minimum.