Init: lab4 done

utils/success.go

@@ -0,0 +1,14 @@
+package utils
+
+import (
+	"io"
+	"net/http"
+)
+
+func Success(w http.ResponseWriter) error {
+	w.WriteHeader(http.StatusOK)
+	w.Header().Set("Content-Type", "text/plain")
+	_, err := io.WriteString(w,
+		`{"code":200, "message": "success"}`+"\n")
+	return err
+}