message: imp(core): more Content-Types
diff: export enum ContentType {
  APPLICATION = 'application/*',
  + APPLICATION_RTF = 'application/rtf',
  + APPLICATION_ZIP = 'application/zip',
  + APPLICATION_X_RAR = 'application/x-rar-compressed',
  + APPLICATION_X_TAR = 'application/x-tar',
  + APPLICATION_X_TZ_COMPRESSED = 'application/x-7z-compressed',
  + APPLICATION_X_WWW_FORM_URLENCODED = 'application/x-www-form-urlencoded',
  + APPLICATION_PDF = 'application/pdf',
  APPLICATION_JSON = 'application/json',
  APPLICATION_JAVASCRIPT = 'application/javascript',
  APPLICATION_ECMASCRIPT = 'application/ecmascript',
  + APPLICATION_XML = 'application/xml',
  APPLICATION_OCTET_STREAM = 'application/octet-stream',
  - APPLICATION_X_WWW_FORM_URLENCODED = 'application/x-www-form-urlencoded',
  + APPLICATION_VND_API_JSON = 'application/vnd.api+json',
  TEXT_PLAIN = 'text/plain',
  TEXT_HTML = 'text/html',
  TEXT_CSS = 'text/css',
  + TEXT_CSV = 'text/csv',
  + IMAGE_WEBP = 'image/webp',
  IMAGE_JPEG = 'image/jpeg',
  IMAGE_PNG = 'image/png',
  IMAGE_GIF = 'image/gif',
  + IMAGE_TIFF = 'image/tiff',
  IMAGE_SVG_XML = 'image/svg+xml',
  AUDIO_MPEG = 'audio/mpeg',
  AUDIO_OGG = 'audio/ogg',
  AUDIO = 'audio/*',
  + VIDEO_WEBM = 'video/webm',
  VIDEO_MP4 = 'video/mp4',
  + FONT_TTF = 'font/ttf',
  + FONT_WOFF = 'font/woff',
  + FONT_WOFF2 = 'font/woff2',
  + MULTIPART_FORM_DATA = 'multipart/form-data',
  }
  