Queries the configurations of a specified forwarding rule.

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameters

Parameter Type Required Example Description
Action String Yes DescribeRuleAttribute

The operation that you want to perform.

Set the value to DescribeRuleAttribute.

RegionId String Yes cn-hangzhou

The ID of the region where the Server Load Balancer (SLB) instance is deployed.

You can call the DescribeRegions operation to query the most recent region list.

RuleId String Yes rule-bp1efemp9****

The ID of the forwarding rule.

Response parameters

Parameter Type Example Description
RuleName String Rule1

The name of the forwarding rule.

LoadBalancerId String lb-bp1ca0zt07t934wxe****

The ID of the SLB instance.

ListenerPort String 90

The listener port that is used by the SLB instance.

Domain String test.com

The domain name that is configured in the forwarding rule.

Url String /cache

The URL that is configured in the forwarding rule.

VServerGroupId String rsp-cige6j****

The ID of the vServer group that is associated with the forwarding rule.

Cookie String wwe

The cookie to be configured on the backend server.

The cookie must be 1 to 200 characters in length and can contain ASCII letters and digits. It cannot contain commas (,), semicolons (;), or whitespace characters. It cannot start with a dollar sign ($).

If you set the StickySession parameter to on and the StickySessionType parameter to server, this parameter is required.

CookieTimeout Integer 12

The timeout period of a cookie.

Valid values: 1 to 86400. Unit: seconds.

Note If you set the StickySession parameter to on and the StickySessionType parameter to insert, this parameter is required.
HealthCheck String off

Specifies whether to enable health checks.

Valid values: on and off.

Note If you set the ListenerSync parameter to off, this parameter is required. If you set the parameter to on, the configuration of the listener is used.
HealthCheckConnectPort Integer 23

The port of the backend server that is used for health checks.

Valid values: 1 to 65535.

Note If you set the HealthCheck parameter to on, this parameter is required. If you left this parameter empty and the HealthCheck parameter is set to on, the backend port configuration of the listener is used by default.
HealthCheckDomain String www.example.com

The domain name that is used for health checks. Valid values:

  • $_ip: The private IP address of the backend server. If the $_ip parameter is set or the HealthCheckDomain parameter is not set, SLB uses the private IP addresses of backend servers as the domain names for health checks.
  • domain: The domain name must be 1 to 80 characters in length. It can contain only letters, digits, periods (.),and hyphens (-).
Note If you set the HealthCheck parameter to on, this parameter is required.
HealthCheckHttpCode String http_3xx

The HTTP status code that indicates a successful health check. Separate multiple HTTP status codes with commas (,). Default value: http_2xx.

Valid values: http_2xx, http_3xx, http_4xx, and http_5xx.

Note If you set the HealthCheck parameter to on, this parameter is required.
HealthCheckInterval Integer 34

The time interval between two consecutive health checks.

Valid values: 1 to 50. Unit: seconds.

Note If you set the HealthCheck parameter to on, this parameter is required.
HealthCheckTimeout Integer 34

The timeout period of a health check response. If a backend ECS instance does not send an expected response within the specified period of time, the ECS instance is considered unhealthy.

Valid values: 1 to 300. Unit: seconds.

Note If the value of the HealthCHeckTimeout parameter is smaller than that of the HealthCheckInterval parameter, the value of the HealthCHeckTimeout parameter is ignored and the value of the HealthCheckInterval parameter is regarded as the waiting period. If you set the HealthCheck parameter to on, this parameter is required.
HealthCheckURI String 10.21.22.1

The URI that is used for health checks.

Note If you set the HealthCheck parameter to on, this parameter is required.
HealthyThreshold Integer 2

The number of consecutive successful health checks that must occur before an unhealthy backend server is declared healthy. In this case, the health check state is changed from fail to success.

Valid values: 2 to 10.

Note If you set the HealthCheck parameter to on, this parameter is required.
ListenerSync String off

Indicates whether the forwarding rule uses the scheduling algorithm, session persistence, and health check configurations of the listener.

Valid values: on and off.

  • off: does not use the configurations of the listener. You can customize health check and session persistence configurations for the forwarding rule.
  • on: uses the configurations of the listener.
RequestId String 9DEC9C28-AB05-4DDF-9A78-6B08EC9CE18C

The ID of the request.

RuleId String rule-hfgnd*****

The ID of the forwarding rule.

Scheduler String wrr

The scheduling algorithm. Valid values:

  • wrr (default): Backend servers that have higher weights receive more requests than backend servers that have lower weights.
  • rr: Requests are distributed to backend servers in sequence.
Note If you set the ListenerSync parameter to off, this parameter is required. If you set the parameter to on, the configuration of the listener is used.
StickySession String off

Indicates whether session persistence is enabled.

Valid values: on and off.

Note If you set the ListenerSync parameter to off, this parameter is required. If you set the parameter to on, the configuration of the listener is used.
StickySessionType String insert

The method that is used to handle a cookie. Valid values:

  • insert: inserts a cookie into the response. SLB inserts a cookie (SERVERID) into the first HTTP or HTTPS response packet that is sent to a client. The next request from the client will contain this cookie, and the listener will distribute this request to the recorded backend server.
  • server: rewrites a cookie. When SLB detects a user-defined cookie, SLB overwrites the original cookie with the user-defined cookie. The next request from the client contains the user-defined cookie, and the listener distributes the request to the recorded backend server.
Note If you set the StickySession parameter to on, this parameter is required.
UnhealthyThreshold Integer 3

The number of consecutive failed health checks that must occur before a healthy backend server is declared unhealthy. In this case, the health check state is changed from success to fail.

Valid values: 2 to 10.

Note If you set the HealthCheck parameter to on, this parameter is required.

Examples

Sample requests

http(s)://[Endpoint]/?Action=DescribeRuleAttribute
&RegionId=cn-hangzhou
&RuleId=rule-bp1efemp9suk5
&<Common request parameters>

Sample success responses

XML format 

<DescribeRuleAttributeResponse>	
	  <Domain>test.com</Domain>
	  <VServerGroupId>rsp-bp114nimo4kl9</VServerGroupId>
	  <LoadBalancerId>lb-bp1ca0zt07t934wxezyxo</LoadBalancerId>
	  <RuleName>Rule2</RuleName>
	  <ListenerPort>90</ListenerPort>
	  <RequestId>DB3C28EE-9A6C-4FFA-8759-4ED8346A675E</RequestId>
	  <ListenerSync>on</ListenerSync>
</DescribeRuleAttributeResponse>

JSON format 

{
    "Domain": "test.com", 
    "VServerGroupId": "rsp-bp114nimo4kl9", 
    "LoadBalancerId": "lb-bp1ca0zt07t934wxezyxo", 
    "RuleName": "Rule2", 
    "ListenerPort": 90, 
    "RequestId": "DB3C28EE-9A6C-4FFA-8759-4ED8346A675E", 
    "ListenerSync": "on"
}

Error codes

For a list of error codes, visit the API Error Center.