使用 Perl 监控网站的性能和 uptime

******************************************************
+--------------------------------------------------------------------------------+
|                              Time: 23:26:31                                    |
|          HOST                                  STATUS       RESPONSE           |
+--------------------------------------------------------------------------------+
| http://www.yahoo.com/                          ACCESSED   Response 1 seconds   |
| http://www.hotmail.com/                        ACCESSED   Response 1 seconds   |
| http://www.ebay.com/                           ACCESSED   Response 1 seconds   |
| http://www.example.com/                        ACCESSED   Response 0 seconds   |
| http://www.not/ a real site.com                WRONG       N/A                 |
+--------------------------------------------------------------------------------+
|                              Time: 23:30:17                                    |
|          HOST                                  STATUS       RESPONSE           |
+--------------------------------------------------------------------------------+
| http://www.yahoo.com/                          ACCESSED   Response 0 seconds   |
| http://www.hotmail.com/                        ACCESSED   Response 0 seconds   |
| http://www.ebay.com/                           ACCESSED   Response 1 seconds   |
| http://www.example.com/                        ACCESSED   Response 0 seconds   |
| http://www.not/ a real site.com                WRONG       N/A                 |
+--------------------------------------------------------------------------------+
|                              Time: 23:31:26                                    |
|          HOST                                  STATUS       RESPONSE           |
+--------------------------------------------------------------------------------+
| http://www.yahoo.com/                          ACCESSED   Response 0 seconds   |
| http://www.hotmail.com/                        ACCESSED   Response 1 seconds   |
| http://www.ebay.com/                           ACCESSED   Response 0 seconds   |
| http://www.example.com/                        ACCESSED   Response 0 seconds   |
| http://www.not/ a real site.com                WRONG       N/A                 |