Updated on 2022-08-15 GMT+08:00

Adding a Forwarding Policy

Function

This API is used to add a forwarding policy. The listener and forwarding policy determine how traffic is forwarded to backend servers.

  • By matching the URL or domain name specified in the forwarding policy when action is set to REDIRECT_TO_POOL, the load balancer distributes the traffic to backend servers in a specific backend server group.
  • When action is set to REDIRECT_TO_LISTENER, the HTTP listener is redirected to an HTTPS listener, and requests are routed by the HTTPS listener.

Constraints

Currently, only redirects from an HTTP listener to an HTTPS listener are supported. When action is set to REDIRECT_TO_LISTENER, the listener specified by listener_id can only be an HTTP listener, and the listener specified by redirect_listener_id can only be an HTTPS listener.

The load balancer of the HTTPS listener to which traffic is redirected must be the same as that of the HTTP listener.

URI

POST /v2/{project_id}/elb/l7policies

Table 1 Parameter description

Parameter

Mandatory

Type

Description

project_id

Yes

String

Specifies the project ID.

Request

Table 2 Parameter description

Parameter

Mandatory

Type

Description

l7policy

Yes

L7policy object

Specifies the forwarding policy. For details, see Table 3.

Table 3 l7policy parameter description

Parameter

Mandatory

Type

Description

tenant_id

No

String

Specifies the ID of the project where the forwarding policy is used.

The value must be the same as the value of project_id in the token.

The value contains a maximum of 255 characters.

name

No

String

Specifies the forwarding policy name.

The value contains a maximum of 255 characters.

admin_state_up

No

Boolean

Specifies the administrative status of the forwarding policy.

This parameter is reserved, and the default value is true.

description

No

String

Provides supplementary information about the forwarding policy.

The value contains a maximum of 255 characters.

listener_id

Yes

String

Specifies the ID of the listener for which the forwarding policy is added.

  • When action is set to REDIRECT_TO_POOL, forwarding policies can be added to a listener with protocol set to HTTP or TERMINATED_HTTPS.
  • When action is set to REDIRECT_TO_LISTENER, forwarding policies can be added to a listener with protocol set to HTTP.

action

Yes

String

Specifies whether requests are forwarded to another backend server group or redirected to an HTTPS listener.

The value range varies depending on the protocol of the backend server group:

  • REDIRECT_TO_POOL: Requests are forwarded to the backend server group specified by redirect_pool_id.
  • REDIRECT_TO_LISTENER: Requests are redirected from the HTTP listener specified by listener_id to the HTTPS listener specified by redirect_listener_id.

redirect_pool_id

No

String

Specifies the ID of the backend server group to which traffic is forwarded. The default value is null.

This parameter is mandatory when action is set to REDIRECT_TO_POOL.

This parameter cannot be specified when action is set to REDIRECT_TO_LISTENER.

The backend server group must meet the following requirements:

  • Cannot be the default backend server group of the listener.
  • Cannot be the backend server group used by forwarding policies of other listeners.

redirect_listener_id

No

String

Specifies the ID of the listener to which the traffic is redirected. The default value is null.

This parameter is mandatory when action is set to REDIRECT_TO_LISTENER.

This parameter cannot be specified when action is set to REDIRECT_TO_POOL. The listener must meet the following requirements:

  • Can only be an HTTPS listener.
  • Can only be a listener of the same load balancer.

redirect_url

No

String

Specifies the URL to which traffic is redirected. The default value is null.

This parameter is reserved.

The value contains a maximum of 255 characters.

position

No

Integer

Specifies the forwarding priority. The value ranges from 1 to 100. The default value is 100.

This parameter is reserved.

rules

No

Array of Rules objects

Lists the forwarding rules of the forwarding policy. For details, see Table 4.

The list contains a maximum of two rules, and the type parameter of each rule must be unique.

Table 4 rules parameter description

Parameter

Type

Mandatory

Description

admin_state_up

Boolean

No

Specifies the administrative status of the forwarding rule.

This parameter is reserved, and the default value is true.

type

String

Yes

Specifies the match type of a forwarding rule.

The value range varies depending on the protocol of the backend server group:

  • HOST_NAME: matches the domain name in the request.
  • PATH: matches the path in the request.

The match type of forwarding rules in a forwarding policy must be unique.

compare_type

String

Yes

Specifies the match mode. The options are as follows:

When type is set to HOST_NAME, the value of this parameter can only be the following:

  • EQUAL_TO: indicates exact match.

When type is set to PATH, the value of this parameter can be one of the following:

  • REGEX: indicates regular expression match.
  • STARTS_WITH: indicates prefix match.
  • EQUAL_TO: indicates exact match.

invert

Boolean

No

Specifies whether reverse matching is supported.

The value can be true or false. The default value is false.

This parameter is reserved.

key

String

No

Specifies the key of the match content. The default value is null.

This parameter is reserved.

value

String

Yes

Specifies the value of the match content. The value cannot contain spaces.

  • When type is set to HOST_NAME, the value can contain a maximum of 100 characters that contain only letters, digits, hyphens (-), and periods (.), and must start with a letter or digit.
  • When type is set to PATH, the value can contain a maximum of 128 characters. When compare_type is set to STARTS_WITH or EQUAL_TO, the value must start with a slash (/) and can contain only letters, digits, and special characters _~';@^-%#&$.*+?,=!:| \/()[]{}

Response

Table 5 Parameter description

Parameter

Type

Description

l7policy

L7policy object

Specifies the forwarding policy. For details, see Table 6.

Table 6 l7policy parameter description

Parameter

Type

Description

id

String

Specifies the forwarding policy ID.

tenant_id

String

Specifies the ID of the project where the forwarding policy is used.

name

String

Specifies the forwarding policy name.

admin_state_up

Boolean

Specifies the administrative status of the forwarding policy.

This parameter is reserved. The value can be true or false.

  • true: Enabled
  • false: Disabled

description

String

Provides supplementary information about the forwarding policy.

listener_id

String

Specifies the ID of the listener to which the forwarding policy is added.

action

String

Specifies whether requests are forwarded to another backend server group or redirected to an HTTPS listener.

The value range varies depending on the protocol of the backend server group:

  • REDIRECT_TO_POOL: Requests are forwarded to the backend server group specified by redirect_pool_id.
  • REDIRECT_TO_LISTENER: Requests are redirected from the HTTP listener specified by listener_id to the HTTPS listener specified by redirect_listener_id.

redirect_pool_id

String

Specifies the ID of the backend server group to which traffic is forwarded.

redirect_listener_id

String

Specifies the ID of the listener to which the traffic is redirected.

redirect_url

String

Specifies the URL to which traffic is redirected.

This parameter is reserved.

rules

Array of Rules objects

Lists the forwarding rules of the forwarding policy. For details, see Table 7.

position

Integer

Specifies the forwarding priority. The value ranges from 1 to 100. The default value is 100.

This parameter is reserved.

provisioning_status

String

This parameter is reserved, and its value can only be ACTIVE.

It specifies the provisioning status of the forwarding policy.

Table 7 rules parameter description

Parameter

Type

Description

id

String

Specifies the ID of the associated forwarding rule.

Example Request

  • Example request 1: Adding a forwarding policy
    POST https://{Endpoint}/v2/573d73c9f90e48d0bddfa0eb202b25c2/elb/l7policies
    
    {
        "l7policy": {
            "name": "niubiao_yaqing_api-2", 
            "listener_id": "3e24a3ca-11e5-4aa3-abd4-61ba0a8a18f1", 
            "action": "REDIRECT_TO_POOL", 
            "redirect_pool_id": "6460f13a-76de-43c7-b776-4fefc06a676e", 
            "rules": [
                {
                    "type": "PATH", 
                    "compare_type": "EQUAL_TO", 
                    "value": "/test"
                }, 
                {
                    "type": "HOST_NAME", 
                    "compare_type": "EQUAL_TO", 
                    "value": "www.test.com"
                }
            ]
        }
    }

Example Response

  • Example response 1
    {
        "l7policy": {
            "redirect_pool_id": "6460f13a-76de-43c7-b776-4fefc06a676e", 
            "description": "", 
            "admin_state_up": true, 
            "rules": [
                {
                    "id": "742600d9-2a14-4808-af69-336883dbb590"
                }, 
                {
                    "id": "3251ed77-0d52-412b-9310-733636bb3fbf"
                }
            ], 
            "tenant_id": "573d73c9f90e48d0bddfa0eb202b25c2", 
            "listener_id": "3e24a3ca-11e5-4aa3-abd4-61ba0a8a18f1", 
            "redirect_url": null, 
            "redirect_listener_id": null, 
            "action": "REDIRECT_TO_POOL", 
            "position": 100, 
            "provisioning_status": "ACTIVE", 
     
            "id": "65d6e115-f179-4bcd-9bbb-1484e5f8ee81", 
            "name": "niubiao_yaqing-_api-2"
        }
    }

Status Code

For details, see Status Codes.