MVC FilePathResult操作导致Chrome中的重复请求

我有一个MVC操作，调用如下：

http://localhost/Report/PrintContainerMasterTrayList?containerMasterId=x&type=downloadview

动作具有以下特征

public ActionResult PrintContainerInstanceTrayList(int containerInstanceId, string type)

返回如下FilePathResult：

return File(filename, "application/pdf");

这一切都很好，只是在Chrome中请求会触发两次。该请求在Firefox和IE11中只发出一次。

原始请求

GET http://localhost/DEV-SAF/Report/PrintContainerMasterTrayList?containerMasterId=x&type=downloadview HTTP/1.1 Host: localhost Connection: keep-alive Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Encoding: gzip, deflate, sdch Accept-Language: en-GB,en;q=0.8 Cookie: .ASPXANONYMOUS=-

第二个请求

GET http://localhost/DEV-SAF/Report/PrintContainerMasterTrayList?containerMasterId=x&type=downloadview HTTP/1.1 Host: localhost Connection: keep-alive User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36 Accept: */* Referer: http://localhost/DEV-SAF/Report/PrintContainerMasterTrayList?containerMasterId=x&type=downloadview Accept-Encoding: gzip, deflate, sdch Accept-Language: en-GB,en;q=0.8

来自两个请求的响应是相同的（在这种情况下，最高可达使用过多带宽的4Mb文件）。

是什么导致了这种行为？

编辑

第一个请求的响应是HTTP/1.1 200 OK Cache-Control: private, s-maxage=0 Content-Type: application/pdf Server: Microsoft-IIS/10.0 Set-Cookie: .AUTH=xxxxxx; path=/; HttpOnly X-AspNetMvc-Version: 5.2 Date: Wed, 03 Aug 2016 14:17:41 GMT Content-Length: 3999

第二个请求的响应是HTTP/1.1 200 OK Cache-Control: private, s-maxage=0 Content-Type: application/pdf Server: Microsoft-IIS/10.0 X-AspNetMvc-Version: 5.2 Date: Wed, 03 Aug 2016 14:17:46 GMT Content-Length: 3999

Response.AppendHeader("Content-Disposition", "attachment");