access_log_format_escape: json

access_log_format:'{"time":"$time_iso8601","remote_addr":"$proxy_protocol_addr","x_forward_for":"$proxy_add_x_forwarded_for","remote_user":"$remote_user","bytes_sent":$bytes_sent,"request_time":$request_time,"status":$status,"vhost":"$host","request_proto":"$server_protocol","path":"$uri","request_query":"$args","request_length":$request_length,"duration":$request_time,"method":"$request_method","http_referrer":"$http_referer","http_user_agent":"$http_user_agent","upstream_addr":"$upstream_addr","upstream_response_time":"$upstream_response_time","upstream_status":"$upstream_status","upstream_scheme":"$upstream_scheme","upstream_host":"$upstream_host","upstream_uri":"$upstream_uri","http_host":"$http_host","request":"$request","time_local":"$time_local","body_bytes_sent":"$body_bytes_sent"}'

注意低版本的apisix配置此引數不會生效，而且不會報錯