This topic describes the fields of layer-7 access logs of Server Load Balancer (SLB).
| Field | Description |
|---|---|
| __topic__ | The topic of the log entry. Valid value: slb_layer7_access_log. |
| body_bytes_sent | The size of the HTTP response message body sent to the client. Unit: bytes. |
| client_ip | The IP address of the client. |
| host | The IP address of the server. The value is first obtained from the request parameters. If no value is obtained, the value is obtained from the host header field. If the value still cannot be obtained, the IP address of the backend server that processes the request is obtained as the field value. |
| http_host | The host header in the request message. |
| http_referer | The HTTP referer header in the request message received by the proxy. |
| http_user_agent | The HTTP user-agent header in the request message received by the proxy. |
| http_x_forwarded_for | The x-forwarded-for content in the request message received by the proxy. |
| http_x_real_ip | The real IP address of the client. |
| read_request_time | The time when the proxy reads the request message. Unit: milliseconds. |
| request_length | The length of the request message, which includes the startline, HTTP headers, and HTTP body. |
| request_method | The request method. |
| request_time | The duration between the time when the proxy receives the first request message and the time when the proxy returns a response message. Unit: seconds. |
| request_uri | The request URI received by the proxy. |
| scheme | The request schema. Valid values: http and https. |
| server_protocol | The HTTP version received by the proxy, for example, HTTP/1.0 or HTTP/1.1. |
| slb_vport | The listening port of the SLB instance. |
| slbid | The ID of the SLB instance. |
| ssl_cipher | The cipher suite used to establish an SSL connection, for example, ECDHE-RSA-AES128-GCM-SHA256. |
| ssl_protocol | The protocol used to establish an SSL connection, such as TLSv1.2. |
| status | The HTTP status code sent from the proxy. |
| tcpinfo_rtt | The round-trip time (RTT) of TCP packets. Unit: milliseconds. |
| time | The time when the log entry is generated. |
| upstream_addr | The IP address and port number of the backend server. |
| upstream_response_time | The duration of the connection between the proxy and backend server. Unit: seconds. |
| upstream_status | The HTTP status code received by the proxy from the backend server. |
| vip_addr | The virtual IP address. |
| write_response_time | The response duration of the proxy. Unit: milliseconds. |