module Ethon::Curls::FormOptions

def form_options

https://github.com/bagder/curl/blob/master/lib/formdata.h#L51 for details
Form options, used by FormAdd for temporary storage, refer 
def form_options
  [
    :none,
    :copyname,
    :ptrname,
    :namelength,
    :copycontents,
    :ptrcontents,
    :contentslength,
    :filecontent,
    :array,
    :obsolete,
    :file,
    :buffer,
    :bufferptr,
    :bufferlength,
    :contenttype,
    :contentheader,
    :filename,
    :end,
    :obsolete2,
    :stream,
    :last
  ]
end