HTTPヘッダ情報チェック
| HTTP/1.1 200 OK | |
| Server | nginx/1.25.4 |
| Date | Sat, 20 Apr 2024 11:34:47 GMT |
| Content-Type | text/html |
| Content-Length | 60543 |
| Connection | keep-alive |
| Keep-Alive | timeout=10 |
| Vary | Accept-Encoding |
| Last-Modified | Fri, 16 Dec 2022 07:07:17 GMT |
| ETag | "ae02b1-ec7f-5efec9eb7f654" |
| Accept-Ranges | bytes |