Adding a Forwarding Policy

Updated on 2025-02-24 GMT+08:00

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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. The value can only be 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 can be: 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. The value can only be true.
type	String	Yes	Specifies the match type of a forwarding rule. The value can be: 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. The value can only be true.
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 can be: 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 request 2: Creating a redirect

POST https://{Endpoint}/v2/573d73c9f90e48d0bddfa0eb202b25c2/elb/l7policies

{
    "l7policy": {
        "action": "REDIRECT_TO_LISTENER", 
        "listener_id": "4ef8553e-9ef7-4859-a42d-919feaf89d60", 
        "redirect_listener_id": "3ee10199-a7b4-4784-93cd-857afe9d0890", 
        "name": "redirect-test"
    }
}

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"
    }
}

Example response 2

{
    "l7policy": {
        "redirect_pool_id": null, 
        "description": "", 
        "admin_state_up": true, 
        "rules": [ ], 
        "tenant_id": "573d73c9f90e48d0bddfa0eb202b25c2", 
        "listener_id": "4ef8553e-9ef7-4859-a42d-919feaf89d60", 
        "redirect_url": null, 
        "redirect_listener_id": "3ee10199-a7b4-4784-93cd-857afe9d0890", 
        "action": "REDIRECT_TO_LISTENER", 
        "position": 100, 
        "provisioning_status": "ACTIVE", 
 
        "id": "bc4e4338-480f-4a98-8245-5bb1964f0e1d", 
        "name": "redirect-test"
    }
}