send_request_with_body_data

# File lib/net/http/generic_request.rb, line 209
  def send_request_with_body_data(sock, ver, path, params)
    if /\Amultipart\/form-data\z/ !~ self.content_type
      self.content_type = 'application/x-www-form-urlencoded'
      return send_request_with_body(sock, ver, path, URI.encode_www_form(params))
    end

    opt = @form_option.dup
    require 'securerandom' unless defined?(SecureRandom)
    opt[:boundary] ||= SecureRandom.urlsafe_base64(40)
    self.set_content_type(self.content_type, boundary: opt[:boundary])
    if chunked?
      write_header sock, ver, path
      encode_multipart_form_data(sock, params, opt)
    else
      require 'tempfile'
      file = Tempfile.new('multipart')
      file.binmode
      encode_multipart_form_data(file, params, opt)
      file.rewind
      self.content_length = file.size
      write_header sock, ver, path
      IO.copy_stream(file, sock)
      file.close(true)
    end
  end