handle case if page responds not ok status

main.go

@@ -38,6 +38,12 @@ func getArticleMetadata(url string) (*ArticleMetadata, error) {
 	}
 	defer resp.Body.Close()
 
+	if resp.StatusCode < 200 || resp.StatusCode >= 400 {
+		return &ArticleMetadata{
+			Title: url,
+		}, nil
+	}
+
 	doc, err := goquery.NewDocumentFromReader(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("failed to parse page html: %v", err)