Content-Type: application/octet-stream;
name="=?gb2312?B?18rBzy5yYXI=?="
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="=?gb2312?B?18rBzy5yYXI=?="UmFyIRoHAM+QcwAADQAAAAAAAABSl3TggioAAAAAAAAAAAACAAAAAFeHujAUMAoAEAAAANfKwc8A
jWBEmWXwkXSggr4Atx0AADliAAACzeNjWSxqujAdM54AIAAAANfKwc9cQ1NETl/OxLW11tDQxF/K
tdW9RGV2aWNlSW9Db250cm9sINau0rujus2ouf1BUEm3w87KyeixuMf9tq+zzNDyLmh0bQCNYESZ
ZVxDAFNETl+qh2VjaC1Ow18oX55bGGJEAGV2aWMAZUlvQwBvbnRyAm9sIEtOqgBOGv8akMePAkFQ
这是示例
它改变了filename="=?gb2312?B?18rBzy5yYXI=?="