code: public /*@Nullable*/Downloader startGetFile(final String path, /*@Nullable*/String rev)
              throws DbxException
      {
          DbxPathV1.checkArgNonRoot("path", path);
          String apiPath = "1/files/auto" + path;
          /*@Nullable*/String[] params = {
              "rev", rev
          };
          return startGetSomething(apiPath, params);
      }
docs: Retrieve a file's content and content metadata.  You must call the {@link Downloader}'s
  {@code close()} method; use a {@code try}/{@code finally}.
  
  <pre>
  DbxClientV1 dbxClient = ...
  DbxClientV1.Downloader downloader = dbxClient.startGetFile("/ReadMe.txt")
  try {
  printStream(downloader.body)
  }
  finally {
  downloader.close()
  }
  </pre>
  
  @param rev
  The {@link DbxEntry.File#rev rev} of the file to retrieve,
  or {@code null} if you want the latest revision of the file.
  
  @param path
  The path (starting with "/") to the file or folder on Dropbox.
  (see {@link DbxPathV1}).
  
  @return
  An object that can be used to download the file contents, or
  {@code null} if there is no file at the requested path.