internal product index

cmd/cart/pool-server.go

@@ -80,10 +80,10 @@ func (s *PoolServer) AddSkuToCartHandler(w http.ResponseWriter, r *http.Request,
 		// product-fetcher's "product service returned %d for sku %s" shape so
 		// upstream code that pattern-matches that string still works, AND we
 		// publish StatusNotFound so the HTTP response carries the right code
-		// (the handler's error-return path otherwise renders as 500).
-		w.Header().Set("Content-Type", "application/json")
-		w.WriteHeader(http.StatusNotFound)
-		_, _ = w.Write([]byte(fmt.Sprintf(`{"error":"product service returned %d for sku %s (bus-deleted)","sku":%q}`, 404, sku, sku)))
+		// (the handler's error-return path otherwise renders as 500). http.Error
+		// is the idiomatic stdlib call here — it does the encoding-safe text body
+		// (no fmt.Sprintf/JSON-string-escaping fragility).
+		http.Error(w, fmt.Sprintf("product service returned %d for sku %s (bus-deleted)", 404, sku), http.StatusNotFound)
 		return nil
 	}
 	msg, err := GetItemAddMessage(r.Context(), sku, 1, getCountryFromHost(r.Host), nil)