class Faraday::Parts::ParamPart

def build_part(boundary, name, value, headers = {})
  part = ''
  part << "--#{boundary}\r\n"
  part << "Content-Disposition: form-data; name=\"#{name}\"\r\n"
  part << "Content-Type: #{headers['Content-Type']}\r\n" if headers["Content-Type"]
  part << "\r\n"
  part << "#{value}\r\n"
end

def initialize(boundary, name, value, headers = {})
  @part = build_part(boundary, name, value, headers)
  @io = StringIO.new(@part)
end