The Content-disposition header tells the browser that this spreadsheet should be stored as a file and recommends a name, in this case pivot.xml.
Content-disposition头部告诉浏览器该电子表格应该被存储为文件，并推荐一个名称，本例中是 pivot.xml。
The Content-Disposition header includes the name of the control. For files, it also contains the file name.
（内容布置）报头包括控件名称。对于文件，它也包括文件名。
The Content-Disposition header includes the name of the control. For files, it also contains the file name.
（内容布置）报头包括控件名称。对于文件，它也包括文件名。
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