Major refactorings.

Introduce summaries.

utils/http.go

@@ -0,0 +1,14 @@
+package utils
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func RespondJSON(w http.ResponseWriter, status int, object interface{}) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	if err := json.NewEncoder(w).Encode(object); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+}