很抱歉您正在查找的文件未找到。
We are very sorry, but the file you are looking for doesn't found.
否则，发生中断以 find（查找），并且异常处理程序发出标准的 file not found（文件未找到）错误。
Otherwise, a trap occurs for find, and the exception handler emits the standard file not found error.
在此之前，我们想在出现错误404(文件未找到)时，会显示一个好看的页面；我们使用Plack： Middleware： ErrorDocument来完成这项任务。
On top of this we want to have a nice looking page when there is a 404 (file not found); for this we will use Plack: : Middleware: : ErrorDocument.
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