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Simple Log Service:Server Load Balancer

Last Updated:Jun 10, 2026

Lists the fields in Server Load Balancer (SLB) Layer 7 access logs.

Log field

Description

__topic__

Log topic. Fixed value: slb_layer7_access_log.

owner_id

Alibaba Cloud account ID.

region

Region of the instance.

instance_id

Instance ID.

instance_name

Instance name.

network_type

Network type. Valid values:

  • VPC: virtual private cloud

  • Classic: classic network

vpc_id

VPC ID.

body_bytes_sent

Bytes in the body sent to the client.

client_ip

Client IP address.

client_port

Client port.

host

Host name. Retrieved from request parameters first, then the host header. Falls back to the backend server IP address.

http_host

Host header in the request.

http_referer

HTTP Referer header in the request received by the proxy.

http_user_agent

HTTP User-Agent header in the request received by the proxy.

http_x_forwarded_for

HTTP X-Forwarded-For header in the request received by the proxy.

http_x_real_ip

Real IP address of the client.

read_request_time

Time for the proxy to read the request, in milliseconds.

request_length

Length of the request, including the start line, HTTP header, and HTTP body.

request_method

Request method.

request_time

Time from when the proxy receives the first request to when it returns the response, in seconds.

request_uri

URI of the request received by the proxy.

scheme

Request scheme.

server_protocol

HTTP protocol version received by the proxy.

slb_vport

Listener port of the SLB instance.

slbid

SLB instance ID.

ssl_cipher

SSL cipher used.

ssl_protocol

Protocol used to establish the SSL connection.

status

Response status from the proxy.

tcpinfo_rtt

TCP round-trip time (RTT) of the client, in microseconds.

time

Time when the log was recorded.

upstream_addr

IP address and port of the backend server.

upstream_response_time

Time from when SLB connects to the backend server until it receives all data and closes the connection, in seconds.

upstream_status

Response status code from the backend server.

vip_addr

VIP address.

write_response_time

Time for the proxy to write the response, in milliseconds.