POST /send HTTP/1.1
Host: localhost:18045
User-Agent: curl/7.76.1
Accept: */*
Content-Length: 199
Content-Type: multipart/form-data; boundary=------------------------53b3d5d529be2ef6

--------------------------53b3d5d529be2ef6
Content-Disposition: form-data; name="foo"; filename="-"
Content-Transfer-Encoding: base64

JUJPTERodwo=
--------------------------53b3d5d529be2ef6--