Queries the forwarding rules that are configured for a specified listener.

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 DescribeRules

The operation that you want to perform.

Set the value to DescribeRules.

ListenerPort Integer Yes 90

The frontend listener port that is used by the Server Load Balancer (SLB) instance.

Valid values: 1 to 65535.

LoadBalancerId String Yes lb-bp1ca0zt07t934******

The ID of the SLB instance.
RegionId String Yes cn-hangzhou

The ID of the region where the SLB instance is deployed.

You can call the DescribeRegions operation to query region IDs.

ListenerProtocol String No https

The frontend listener protocol that is used by the SLB instance.

Note This parameter is required when listeners that use different protocols listen on the same port.

Response parameters

Parameter Type Example Description
RequestId String 9DEC9C28-AB05-4DDF-9A78-6B08EC9CE18C

The ID of the request.
Rules Array of Rule

The list of forwarding rules.
Rule
RuleId String rule-tybqi6******

The ID of the forwarding rule.
RuleName String Rule2

The name of the forwarding rule. The name must be 1 to 80 characters in length, and can contain only letters, digits, hyphens (-), forward slashes (/), periods (.), and underscores (_).

Note The name of each forwarding rule must be unique within a listener.
Domain String test.com

The requested domain name specified in the forwarding rule.
Url String /cache

The requested URL specified in the forwarding rule.
VServerGroupId String rsp-6cejjzl******

The ID of the destination vServer group specified in the forwarding rule.
Cookie String 23

The cookie that is configured on the backend server.

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

Note If you set the StickySession parameter to on and the StickySessionType parameter to server, this parameter is required.
CookieTimeout Integer 56

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

Indicates whether health checks are 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.
HealthCheckConnectPort Integer 45

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

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.domain.com

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

  • $_ip: The private IP address of the backend server.

    If you do not set this parameter or set the parameter to $_ip, the SLB instance uses the private IP address of each backend server as the domain name for health checks.

  • domain: The domain name must be 1 to 80 characters in length. The domain name 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. Multiple HTTP status codes are separated by 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 5

The 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 for a health check response. If a backend ECS instance does not return an expected response within the specified period of time, the backend server is declared 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 /example

The URL that is used for health checks.

Note If you set the HealthCheck parameter to on, this parameter is required.
HealthyThreshold Integer 5

Indicates the number of times that an unhealthy backend server must consecutively pass health checks before it is declared healthy (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.
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 contains this cookie and the listener distributes this request to the recorded backend server.
  • server: rewrites the original 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 2

The number of consecutive health check failures required before a backend server is declared unhealthy (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=DescribeRules
&ListenerPort=90
&LoadBalancerId=lb-bp1ca0zt07t93******
&RegionId=cn-hangzhou
&<Common request parameters>

Sample success responses

XML format 

<DescribeRulesResponse>
  <RequestId>9DEC9C28-AB05-4DDF-9A78-6B08EC9CE18C</RequestId>
  <Rules>
        <Rule>
              <Cookie>23</Cookie>
              <CookieTimeout>56</CookieTimeout>
              <VServerGroupId>rsp-6cejjzl******</VServerGroupId>
              <HealthCheckInterval>5</HealthCheckInterval>
              <UnhealthyThreshold>2</UnhealthyThreshold>
              <HealthCheckURI>/example</HealthCheckURI>
              <Scheduler>wrr</Scheduler>
              <RuleId>rule-tybqi6******</RuleId>
              <HealthCheck>off</HealthCheck>
              <HealthCheckTimeout>34</HealthCheckTimeout>
              <Url>/cache</Url>
              <StickySession>off</StickySession>
              <HealthCheckConnectPort>45</HealthCheckConnectPort>
              <HealthyThreshold>5</HealthyThreshold>
              <HealthCheckDomain>www.domain.com</HealthCheckDomain>
              <ListenerSync>off</ListenerSync>
              <StickySessionType>insert</StickySessionType>
              <Domain>test.com</Domain>
              <HealthCheckHttpCode>http_3xx</HealthCheckHttpCode>
              <RuleName>Rule2</RuleName>
        </Rule>
  </Rules>
</DescribeRulesResponse>

JSON format 

{"RequestId":"9DEC9C28-AB05-4DDF-9A78-6B08EC9CE18C","Rules":{"Rule":[{"Cookie":"23","CookieTimeout":"56","VServerGroupId":"rsp-6cejjzl******","HealthCheckInterval":"5","UnhealthyThreshold":"2","HealthCheckURI":"/example","Scheduler":"wrr","RuleId":"rule-tybqi6******","HealthCheck":"off","HealthCheckTimeout":"34","Url":"/cache","StickySession":"off","HealthCheckConnectPort":"45","HealthyThreshold":"5","HealthCheckDomain":"www.domain.com","ListenerSync":"off","StickySessionType":"insert","Domain":"test.com","HealthCheckHttpCode":"http_3xx","RuleName":"Rule2"}]}}

Error codes

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