Logging: Add some error output

server.go

@@ -89,6 +89,7 @@ func doSetCur(w http.ResponseWriter, r *http.Request) {
 	if !found {
 		w.WriteHeader(404)
 		fmt.Fprintf(w, "Target %s not found", tgt)
+		log.Printf("setcur: target %s not configured", tgt)
 	}
 }
 
@@ -164,6 +165,10 @@ func doSwitch(dir bool, tgt string, w http.ResponseWriter) {
 	}
 	if len(errs) > 0 {
 		w.WriteHeader(503)
+		log.Printf("Switch resulted in %d errors:", len(errs))
+		for i, e := range errs {
+			log.Printf("[%d/%d]: %s", i, len(errs), e)
+		}
 	}
 	for _, o := range res {
 		fmt.Fprint(w, o)