outlook试图通过电子邮件签名中的webdav访问图像

我有一个HTML电子邮件签名和1个图像在线托pipe。 在Outlook 2010中，它试图通过webdav来获得这一点，一旦用户需要一段时间，webdav就会失败，然后通过http获取。 我怎样才能防止这种情况发生？

webserver上的日志文件

"PROPFIND /wp-content/uploads/Spectrum_logo_email-171w.jpg HTTP/1.1" 405 358 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:26 +0000] "PROPFIND /wp-content/uploads/Spectrum_logo_email-171w.jpg HTTP/1.1" 405 358 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:26 +0000] "PROPFIND / HTTP/1.1" 200 234831 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:26 +0000] "PROPFIND / HTTP/1.1" 200 234831 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:26 +0000] "PROPFIND / HTTP/1.1" 200 234831 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:26 +0000] "PROPFIND / HTTP/1.1" 200 234831 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:26 +0000] "OPTIONS / HTTP/1.1" 200 234831 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:26 +0000] "PROPFIND / HTTP/1.1" 200 234831 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 

此外，图像链接链接使用https，但下面的日志是从httpd访问日志，这是没有意义的

有没有办法我可以redirect到一个get？

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从

 "OPTIONS /wp-content/uploads/Spectrum_logo_email-171w.jpg HTTP/1.1" 200 - "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 31.221.13.194 - - [26/Mar/2015:14:35:18 +0000] "PROPFIND /wp-content/uploads/Spectrum_logo_email-171w.jpg HTTP/1.1" 405 358 "-" "Microsoft-WebDAV-MiniRedir/6.1.7601" 

至

 "GET /wp-content/uploads/Spectrum_logo_email-171w.jpg HTTP/1.1" 200 14063 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko"