-----------------------------5169208281820
Content-Disposition: form-data; name="file_1"; filename=""
Content-Type: application/octet-stream


-----------------------------5169208281820
Content-Disposition: form-data; name="file_0"; filename="test.txt"
Content-Type: text/plain

hello world!

-----------------------------5169208281820
Content-Disposition: form-data; name="oper"

upload
-----------------------------5169208281820--