Format changed by parameter

class-gv-rest-views-route.php

<?php
public function get_sub_item( $request ) {
		$url      = $request->get_url_params();
		$view_id  = intval( $url['id'] );
		$entry_id = intval( $url['s_id'] );
		$format   = \GV\Utils::get( $url, 'format', 'json' );

		if (isset($_GET['gv_response_format'])) {
			$format = $_GET['gv_response_format'];
		}

		$view  = \GV\View::by_id( $view_id );
		$entry = \GV\GF_Entry::by_id( $entry_id );

		if ( $format === 'html' ) {
			$renderer = new \GV\Entry_Renderer();
			return $renderer->render( $entry, $view, new Request( $request ) );
		}

		return $this->prepare_entry_for_response( $view, $entry, $request, 'single' );
	}

https://thejohnson.group/wp-json/gravityview/v1/views/22221/entries/55287?gv_response_format=html

Setting format via GET Parameter