在单击打开/保存对话框之前等待几分钟时，文件下载不完整

I am working on a JSF based web application that provides open/save dialog for the user to download an XML file. If user clicks open/save immediately once open/save dialog appears, the file is downloaded completely. But if there is a delay of more than 90 seconds to click open/save after the dialog appears, the downloaded contents are incomplete.I am working on a JSF based web application tha