You can call the SetLoadBalancerHTTPListenerAttribute API to modify the configurations of an HTTP listener.

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Request parameters

Name Type Required? Example value Description
Action String Yes SetLoadBalancerHTTPListenerAttribute

The action to perform. Valid value: SetLoadBalancerHTTPListenerAttribute
ListenerPort Integer Yes 80

The frontend port used by the SLB instance.

Valid values: 1–65535
LoadBalancerId String Yes lb-bp1qjwo61pqz3ahltv0mw

The ID of the SLB instance

RegionId String Yes cn-hangzhou

The region to which the SLB instance belongs.

You can query the region ID by referring to the list of regions and zones or by calling the DescribeRegions API.

AclId String No 123

The ID of the access control list bound to the listener.

If the value of AclStatus is on, this parameter is required.

AclStatus String No off

Whether to enable access control.

Valid values: on | off
AclType String No white

The access control type:

  • white: Indicates a whitelist. Only requests from the IP addresses or CIDR blocks in the selected access control lists are forwarded. It applies to scenarios where an application allows access only from specific IP addresses.
Enabling a white access control list poses some risks to your services.

After a whitelist is enabled, only the IP addresses in the list can access the listener.

If you enable a whitelist without adding any IP addresses to the list, all requests are forwarded.

  • black: Indicates a blacklist. Requests from the IP addresses or CIDR blocks in the selected access control lists are not forwarded (that is, they are blocked). It applies to scenarios where an application denies access only from specific IP addresses.
If you enable a blacklist without adding any IP addresses to the list, all requests are forwarded.

If the value of AclStatus is on, this parameter is required.

Bandwidth Integer No -1

The peak bandwidth of the listener (unit: Mbit/s). Valid values: -1 | 1–5000

  • -1: You can set the peak bandwidth of an Internet SLB instance that is billed by traffic to -1. Then, the peak bandwidth is not restricted.
Cookie String No B490B5EBF6F3CD402E515D22BCDA1598

The cookie configured on the server.

The cookie must be 1 to 200 characters in length and can only contain ASCII English letters and numeric characters. It cannot contain commas (,), semicolons (;), or spaces, nor can it begin with $.

This parameter is required when the value of StickySession is on and the value of StickySessionType is server.

CookieTimeout Integer No 500

Timeout period of the cookie.

Valid values: 1–86400 (seconds).

This parameter is required when the value of StickySession is on and the value of StickySessionType is insert.

Description String No test

A description of the listener

Gzip String No on

Whether to enable Gzip compression to compress a specific file type
HealthCheck String No on

Whether to enable health checks.

Valid values: on | off.

HealthCheckConnectPort Integer No 8080

The port used for health checks.

Valid values: 1–65535
HealthCheckDomain String No $_ip

The domain name used for health checks. Valid values:

  • $_ip: the private IP address of the backend server. If you specify $_ip or do not specify HealthCheckDomain, SLB uses the private IP addresses of backend servers as domain names used for health checks.
  • domain: The domain name must be 1 to 80 characters in length, and can only contain letters, numbers, periods (.), and hyphens (-).
HealthCheckHttpCode String No http_2xx,http_3xx

The HTTPS status codes indicating that the health check is normal. Separate multiple HTTP status codes by commas.

Valid values: http_2xx|http_3xx |http_4xx|http_5xx
HealthCheckInterval Integer No 5

The time interval between two consecutive health checks. Valid values: 1–50 (seconds)

HealthCheckTimeout Integer No 3

The amount of time to wait for the response from a health check. If the backend ECS instances do not send a correct response within the specified time, the health check fails.

Valid values: 1–300 (seconds)

Note If the value of HealthCheckInterval is greater than the value of HealthCheckTimeout , the value of HealthCheckTimeout is invalid, and the timeout is set to the valued of HealthCheckInterval.
HealthCheckURI String No /test/index.html

The URI used for health checks

HealthyThreshold Integer No 4

The number of consecutive successes of health checks before a backend server is declared as healthy (from failure to success).

Valid values: 2–10
IdleTimeout Integer No 12

Specify the idle connection timeout in seconds. Valid values: 1–60. Default value: 15.

If no request is received during the specified timeout period, SLB will temporarily terminate the connection and restart the connection when the next request is received.

RequestTimeout Integer No 3

Specify the request timeout in seconds. Valid values: 1–180. Default value: 60.

If no response is received from the backend server during the specified timeout period, SLB will stop waiting and send an HTTP 504 error to the client.

Scheduler String No wrr

The algorithm used to distribute traffic. Valid values:

  • wrr: A backend server with a higher weight is more likely to be polled.
  • lc: A server with a higher weight will receive more requests.
When the weight is the same, the backend server with a smaller number of connections is more likely to be polled.
  • rr: Requests are evenly and sequentially distributed to backend servers.
StickySession String No on

Whether to enable session persistence. Valid values: on | off
StickySessionType String No on

The method used to handle the cookie. Valid values:

  • insert: Insert the cookie.
SLB adds a cookie to the response (that is, it inserts SERVERID in the HTTP/HTTPS response packet) after it receives the first request from a client. The next request will contain the cookie and the listener will distribute the request to the same backend server.
  • server: Rewrite the cookie.
SLB will overwrite the original cookie when it discovers that a new cookie is set. The next time the client carries the new cookie to access SLB, the listener will distribute the request to the previously recorded backend server.
Note When the value of StickySession is set to on, this parameter is required.
UnhealthyThreshold Integer No 4

The number of consecutive failures of health checks on the same ECS instance before a backend server is declared as unhealthy (from success to failure).

Valid values: 2–10
VServerGroup String No on

Whether to use a VServer group.

Valid values: on | off
VServerGroupId String No rsp-cige6j5e7p

The ID of the VServer group

XForwardedFor String No on

Whether to get the real IP address from a client request through X-Forwarded-For.

Valid values: on (default value) | off
XForwardedFor_SLBID String No on

SLB-ID

Valid values: on | off (default value).

If you do not set this parameter, the default value is used.

XForwardedFor_SLBIP String No on

SLB-IP

Valid values: on | off (default value).

Note If you do not set this parameter, the default value is used.
XForwardedFor_proto String No on

X-Forwarded-Proto

Valid values: on | off (default value).

If you do not set this parameter, the default value is used.

Response parameters

Name Type Example value Description
RequestId String CEF72CEB-54B6-4AE8-B225-F876FF7BA984

The ID of the request

Examples

Request example


http(s)://[Endpoint]/? Action=SetLoadBalancerHTTPListenerAttribute
&ListenerPort=80
&LoadBalancerId=lb-bp1qjwo61pqz3ahltv0mw
&<CommonParameters>

Normal response examples

XML format 

<SetLoadBalancerHTTPListenerAttributeResponse>
  <RequestId>CEF72CEB-54B6-4AE8-B225-F876FF7BA984</RequestId>
</SetLoadBalancerHTTPListenerAttributeResponse>

JSON format 

{
	"RequestId":" CEF72CEB-54B6-4AE8-B225-F876FF7BA984"
}

Error response example

JSON format 

{
	"Message":"The specified parameter is not valid.",
	"RequestId":"0669D684-69D8-408E-A4FA-B9011E0F4E66",
	"HostId":"slb-pop.aliyuncs.com",
	"Code":"InvalidParameter"
}

Error codes

HttpCode Error code Error message Description
400 Operation.NotAllowed Operation Denied. The HTTP listener doesn't support this action. The operation is not allowed. An unfinished purchase order exists.

Click here to view the error codes.