class Constant {
  static const acceptHeaderDefault = 'application/json';
  static const contentTypeHeaderDefault = 'application/json';
  static const pdfMimeType = 'application/pdf';
  static const base64Charset = 'base64';
  static const textHtmlMimeType = 'text/html';
  static const octetStreamMimeType = 'application/octet-stream';
  static const pdfExtension = '.pdf';
  static const imageType = 'image';
  static const textVCardMimeType = 'text/x-vcard';
  static const textPlainMimeType = 'text/plain';
  static const emlMimeType = 'message/rfc822';
  static const mailtoScheme = 'mailto';
  static const attachmentScheme = 'attachment';
  static const emlPreviewerScheme = 'eml-previewer';
  static const htmlExtension = '.html';
  static const slashCharacter = '/';
  static const andCharacter = '&';
}