$this->target_file_path = ( isset( $opt['target_file_path'] ) ) ? $opt['target_file_path'] : false;
$this->upload_session_key = ( isset( $opt['upload_session_key'] ) ) ? $opt['upload_session_key'] : false;
$this->headers_only = ( isset( $opt['headers_only'] ) ) ? $opt['headers_only'] : false;
$this->target_file_path = ( isset( $opt['target_file_path'] ) ) ? $opt['target_file_path'] : false;
$this->upload_session_key = ( isset( $opt['upload_session_key'] ) ) ? $opt['upload_session_key'] : false;
$this->headers_only = ( isset( $opt['headers_only'] ) ) ? $opt['headers_only'] : false;