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配置此参数不会生效，而且不会报错
