問題なくFetchもキャッシュもできています

NicoCache_nl+150304mod+180728mod (く) (based on NicoCache v0.45)
Running with Java 1.8.0_112(amd64) on Windows 7
Google Chrome 69.0.3497.100(Official Build) (64 ビット)
Mozilla/5.0 (Windows NT 6.1; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36