HTTPヘッダ情報チェック
| HTTP/1.1 200 OK | |
| Server | nginx/1.23.1 |
| Date | Tue, 23 Apr 2024 08:38:47 GMT |
| Content-Type | text/html |
| Content-Length | 54838 |
| Connection | keep-alive |
| Last-Modified | Tue, 11 Apr 2023 18:43:20 GMT |
| ETag | "d636-5f913dd924def" |
| Accept-Ranges | bytes |
| Vary | Accept-Encoding |