Fix for API key invalid referer!

Struggles with invalid referer when you have API key restrictions? You will need to edit the load_content function in yotuwp.php. By default, wp_remote_get does NOT send the Referer in the header information. After digging into #37820 it looks like a simple fix, but has to be done in the code. After editing the area where it says $response = wp_remote_get to add the headers section to the array, this plugin will start working. 
To debug and test before and after, add error_log(print_r($response, true)); directly after the original $response line.


public function load_content( $url ) {

        $url .= '&key='. trim($this->api['api_key']);
        if ( $this->is_cache) {
            $cache_id       = md5( $url);
            $cache_content  = $this->cache( $cache_id );

            if( !is_string( $cache_content ) ) {
                $response = wp_remote_get( $url, array(
                    'timeout' => $this->timeout,
                    'headers' => array(
                        'Referer' => home_url()
                    )
                ));
                $this->cache( $cache_id, json_encode( $response ) );
            }else $response = json_decode( $cache_content, true);

        }else
        $response = wp_remote_get( $url, array(
            'timeout' => $this->timeout,
            'headers' => array(
                'Referer' => home_url()
            )
        ));

        if (is_wp_error( $response ) || $response['response']['code'] !== 200)
        {

            $msg = '';

            if( is_array( $response) && isset( $response['body'] ) ) {
                $obj = json_decode( $response['body'] );
                $msg = $obj->error->message;
            }

            if( isset( $response->errors) && isset( $response->errors['http_request_failed'] ) ) {
                $msg = $response->errors['http_request_failed'][0];
            }

            return array( 'items' => array(), 'error' => true, 'msg' => $msg);
        }

        return json_decode( $response['body'] );
    }