This topic describes the fields in Layer 7 access logs of Application Load Balancer (ALB).
| Field | Description |
|---|---|
| __topic__ | The topic of the log. The value is fixed as alb_layer7_access_log. |
| body_bytes_sent | The number of bytes in the body of the HTTP response that is sent to the client. |
| client_ip | The IP address of the client. |
| host | The domain name or IP address of the server. By default, the value is obtained from request parameters. If no value is obtained from request parameters, the value is obtained from the host header field. If no value is obtained from request parameters or the host header field, the IP address of the backend server that processes the request is used as the value. |
| http_host | The host header field of the request. |
| http_referer | The URL of the source web page. |
| http_user_agent | The browser information of the client. |
| http_x_forwarded_for | The client IP address that is recorded after the request of the client is forwarded by the proxy. |
| http_x_real_ip | The real IP address of the client. |
| read_request_time | The time that is taken by the proxy to read the request. Unit: milliseconds. |
| request_length | The length of the request. The request line, request headers, and request body are all counted. |
| request_method | The request method. |
| request_time | The interval between the time when the proxy receives the first request and the time when the proxy returns a response. Unit: seconds. |
| request_uri | The URI of the request that is received by the proxy. |
| scheme | The schema of the request. Valid values: HTTP and HTTPS. |
| server_protocol | The HTTP version of the request that is received by the proxy. Example: HTTP/1.0 or HTTP/1.1. |
| slb_vport | The listening port of the SLB instance. |
| app_lb_id | The ID of the ALB instance. |
| ssl_cipher | The cipher suite that is used to establish an SSL connection. Example: ECDHE-RSA-AES128-GCM-SHA256. |
| ssl_protocol | The protocol that is used to establish an SSL connection. Example: TLSv1.2. |
| status | The HTTP status code that is sent by the proxy. |
| tcpinfo_rtt | The round-trip time (RTT) of the client TCP connection. Unit: microseconds. |
| time | The time when the log is generated. |
| upstream_addr | The IP address and port number of the backend server. |
| upstream_response_time | The interval between the time when the SLB instance connects to the backend server and the time when the SLB instance disconnects from the backend server after the required data is received. |
| upstream_status | The HTTP status code that is received by the proxy from the backend server. |
| vip_addr | The virtual IP address. |
| write_response_time | The time that is taken by the SLB proxy to send the request to the client after the SLB proxy receives the request from the backend server. |
| owner_id | The owner ID of the ALB instance. |
| region | The region where the ALB instance resides. |
| instance_name | The name of the ALB instance. |
| address_type | The address type of the ALB instance. Valid values: Intranet and Internet. |
| vpc_id | The ID of the Virtual Private Cloud (VPC) in which the ALB instance resides. |