Appender to save the downloaded image to.
HTTP URL to fetch.
Filename to save the downloaded image to.
Timeout to use when downloading.
HTTP GET headers to supply when downloading.
Whether or not to always keep downloaded files, even if they're not valid images.
The HTTP code encountered when attempting to download the image. The magic number MagicNumber.fileIsNotAnImage is returned if the downloaded file was detected as not an image.
Downloads an image from the prnt.sc (prntscr.com) server.