code: protected boolean shouldDetectMimeType(String mimeType) {
  		for (String prefix : untrustfulMimeTypes) {
  			if (mimeType.startsWith(prefix)) return true;
  		}
  		return false;
  	}
docs: check if mime-type detection is suggested for mimeType.
  @param mimeType mime-type to test (must not be null/empty/"unk")
  @return {@code true} if mime-type should be determined
  by looking into Resource.