如果文件名中含有+号，并且预览或下载时，提示HTTP 错误 404.11 – Not Found，显示请求筛选模块被配置为拒绝包含双重转义序列的请求，那么可以用以下方式解决：
方法1）在web.config中配置
<system.webServer> <security> <requestFiltering allowDoubleEscaping="true" /> </security> </system.webServer>
方法2）在IIS中配置
请求筛选 — 右侧“编辑功能设置”，勾选“允许双重定义”
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