我有CSP（内容安全策略）插件类型策略设置为白名单PDF类型如下.当试图打开一个PDF文件在iframe与src属性，它是工作良好的浏览器IE 11，和Firefox 47+，但在Chrome 50+失败.还有什么是必要的，使其在Chrome中工作？

Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; object-src 'self'; style-src 'self'; frame-src 'self' plugin-types application/pdf;

chrome控制台出错

Resource interpreted as Document but transferred with MIME type application/pdf
Refused to load 'http://127.0.0.1/module123/open.do?id=10000' (MIME type '') because it violates the following Content Security Policy Directive: 'plugin-types application/pdf'. When enforcing the 'plugin-types' directive, the plugin's media type must be explicitly declared with a 'type' attribute on the containing element (e.g. '<object type="[TYPE GOES HERE]" ...>').