上周，一个 VPS 崩溃了好几次，我试图找出原因。
apache 日志中 /autodiscover/autodiscover.xml 的 404 错误数量相当多，日志不是按时间顺序排列的……
aa.bb.cc.dd - - [02/Feb/2018:09:50:11 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:09:55:32 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:09:58:56 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:10:04:02 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:09:53:50 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:10:00:53 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:10:00:53 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:10:09:06 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:09:50:11 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:10:11:33 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
aa.bb.cc.dd - - [02/Feb/2018:10:06:12 +0100] "POST /autodiscover/autodiscover.xml HTTP/1.1" 301 258 "-" "Microsoft Office/14.0 (Windows NT 6.1; Microsoft Outlook 14.0.7192; Pro)"
我读到日志是按照请求顺序创建的，而不是按完成顺序创建的。这是否意味着从 09:53:50 开始的日志至少需要大约 7 分钟才能完成？
Exchange 向该 URL 发布什么内容？为什么需要几分钟？您认为这会导致服务器崩溃吗？
仅供参考 VPS（2GB RAM、FreeBSD、Apache）安装了一个非常小的网站/CMS（也会生成 404 页面）。我的客户（在其他地方）使用与域关联的 Exchange 服务器。