Updated on 2024-04-09 GMT+08:00

Adding a Listener

Function

This API is used to add a listener to a load balancer.

Constraints

The protocol used by the listener can be TCP, UDP, HTTP, or HTTPS.

  • For load balancing at Layer 4, the protocol can only be TCP or UDP.

  • For load balancing at Layer 7, the protocol can only be HTTP, HTTPS or QUIC.

  • For load balancing both at Layer 4 and Layer 7, TCP, UDP, HTTP, HTTPS and QUIC are supported.

Calling Method

For details, see Calling APIs.

URI

POST /v3/{project_id}/elb/listeners

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Specifies the project ID.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Specifies the token used for IAM authentication.

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

listener

Yes

CreateListenerOption object

Specifies the listener.

Table 4 CreateListenerOption

Parameter

Mandatory

Type

Description

admin_state_up

No

Boolean

Specifies the administrative status of the listener. The value can only be true.

This parameter is unsupported. Please do not use it.

default_pool_id

No

String

Specifies the ID of the default backend server group. If there is no matched forwarding policy, requests will be forwarded to the default backend server for processing.

Minimum: 1

Maximum: 36

client_ca_tls_container_ref

No

String

Specifies the ID of the CA certificate used by the listener. This parameter is available only when type is set to client.

Minimum: 1

Maximum: 128

default_tls_container_ref

No

String

Specifies the ID of the server certificate used by the listener. This parameter is available only when the listener's protocol is HTTPS and type is set to server.

Minimum: 1

Maximum: 128

description

No

String

Provides supplementary information about the listener.

Minimum: 0

Maximum: 255

http2_enable

No

Boolean

Specifies whether to use HTTP/2 if you want the clients to use HTTP/2 to communicate with the listener. However, connections between the load balancer and backend servers still use HTTP/1.x by default. Note:

  • This parameter is available only for HTTPS listeners.

  • You cannot configure this parameter for QUIC listeners, and the fixed value is true.

  • If you configure this parameter for listeners with other protocols, it will not take effect.

insert_headers

No

ListenerInsertHeaders object

Specifies the HTTP header fields that can transmit required information to backend servers. For example, the X-Forwarded-ELB-IP header field can transmit the EIP of the load balancer to backend servers.

loadbalancer_id

Yes

String

Specifies the ID of the load balancer that the listener is added to. Note: A listener can be added to only one load balancer.

Minimum: 1

Maximum: 36

name

No

String

Specifies the listener name. Note: If you leave the listener name empty, you cannot locate it on the listener list and view its details.

Minimum: 0

Maximum: 255

project_id

No

String

Specifies the project ID.

Minimum: 1

Maximum: 32

protocol

Yes

String

Specifies the protocol used by the listener.

The value can be TCP, HTTP, UDP, HTTPS, TERMINATED_HTTPS, QUIC or TLS.

Note:

  • Protocol used by HTTPS listeners added to a shared load balancer can only be set to TERMINATED_HTTPS. If HTTPS is passed, the value will be automatically changed to TERMINATED_HTTPS.

  • Protocol used by HTTPS listeners added to a dedicated load balancer can only be set to HTTPS. If TERMINATED_HTTPS is passed, the value will be automatically changed to HTTPS.

protocol_port

No

Integer

Specifies the port used by the listener. The QUIC listener port cannot be 4789 or the same as the UDP listener port. If this parameter is set to 0, port_ranges is required.

Minimum: 0

Maximum: 65535

sni_container_refs

No

Array of strings

Specifies the IDs of SNI certificates (server certificates with domain names) used by the listener.

Note:

  • The domain names of all SNI certificates must be unique.

  • The total number of domain names of all SNI certificates cannot exceed 50.

  • QUIC listeners support only RSA certificates.

Array Length: 0 - 50

sni_match_algo

No

String

Specifies how wildcard domain name matches with the SNI certificates used by the listener.

longest_suffix indicates longest suffix match. wildcard indicates wildcard match.

The default value is wildcard.

tags

No

Array of Tag objects

Lists the tags.

tls_ciphers_policy

No

String

Specifies the security policy used by the listener.

security_policy_id

No

String

Specifies the ID of the custom security policy.

Minimum: 1

Maximum: 36

enable_member_retry

No

Boolean

Specifies whether to enable health check retries for backend servers. The value can be true (enable health check retries) or false (disable health check retries). The default value is true. Note:

  • If a shared load balancer is associated, this parameter is available only when protocol is set to HTTP or TERMINATED_HTTPS.

  • If a dedicated load balancer is associated, this parameter is available only when protocol is set to HTTP, HTTPS, or QUIC.

keepalive_timeout

No

Integer

Specifies the idle timeout duration, in seconds. If there are no requests reaching the load balancer after the idle timeout duration elapses, the load balancer will disconnect the connection with the client and establish a new connection when there is a new request.

  • For TCP listeners, the value ranges from 10 to 4000, and the default value is 300.

  • For HTTP and HTTPS listeners, the value ranges from 1 to 4000, and the default value is 60.

  • For UDP listeners of shared load balancers, this parameter does not take effect.

client_timeout

No

Integer

Specifies the timeout duration for waiting for a response from a client, in seconds. There are two situations:

  • If the client fails to send a request header to the load balancer within the timeout duration, the request will be interrupted.

  • If the interval between two consecutive request bodies reaching the load balancer is greater than the timeout duration, the connection will be disconnected.

The value ranges from 1 to 300, and the default value is 60.

This parameter is available only for HTTP and HTTPS listeners.

Minimum: 1

Maximum: 300

Default: 60

member_timeout

No

Integer

Specifies the timeout duration for waiting for a response from a backend server, in seconds. If the backend server fails to respond after the timeout duration elapses, the load balancer will stop waiting and return HTTP 504 Gateway Timeout to the client.

The value ranges from 1 to 300, and the default value is 60.

This parameter is available only for HTTP and HTTPS listeners.

Minimum: 1

Maximum: 300

Default: 60

ipgroup

No

CreateListenerIpGroupOption object

Specifies the IP address group associated with the listener.

transparent_client_ip_enable

No

Boolean

Specifies whether to pass source IP addresses of the clients to backend servers.

proxy_protocol_enable

No

Boolean

Specifies whether to enable the ProxyProtocol option to pass the source IP addresses of the clients to backend servers. This parameter is available only for TLS listeners and does not take effect for other types of listeners.

enhance_l7policy_enable

No

Boolean

Specifies whether to enable advanced forwarding. If advanced forwarding is enabled, more flexible forwarding policies and rules are supported. The value can be true (enable advanced forwarding) or false (disable advanced forwarding), and the default value is false.

The following scenarios are supported:

  • action can be set to REDIRECT_TO_URL (requests will be redirected to another URL) or Fixed_RESPONSE (a fixed response body will be returned to clients).

  • Parameters priority, redirect_url_config, and fixed_response_config can be specified in a forwarding policy.

  • Parameter type can be set to METHOD, HEADER, QUERY_STRING, or SOURCE_IP for a forwarding rule.

  • If type is set to HOST_NAME for a forwarding rule, the value parameter of the forwarding rule supports wildcard asterisks (*).

  • The conditions parameter can be specified for forwarding rules.

NOTE:

This fucntion cannot be disabled after it is enabled.

quic_config

No

CreateListenerQuicConfigOption object

Specifies the QUIC configuration for the current listener. This parameter is valid only when protocol is set to HTTPS.

For TCP, UDP, HTTP, QUIC listeners, if this parameter is not left blank, an error will be reported.

NOTE:

The client sends a normal HTTP request that contains information indicating that the QUIC protocol is supported.

If QUIC upgrade is enabled for the listeners, QUIC port and version information will be added to the response header.

When the client sends both HTTPS and QUIC requests to the server, if the QUIC request is successfully sent, QUIC protocol will be used for subsequent communications.

Table 5 ListenerInsertHeaders

Parameter

Mandatory

Type

Description

X-Forwarded-ELB-IP

No

Boolean

Specifies whether to transparently transmit the load balancer EIP to backend servers. If X-Forwarded-ELB-IP is set to true, the load balancer EIP will be stored in the HTTP header and passed to backend servers.

X-Forwarded-Port

No

Boolean

Specifies whether to transparently transmit the listening port of the load balancer to backend servers. If X-Forwarded-Port is set to true, the listening port of the load balancer will be stored in the HTTP header and passed to backend servers.

X-Forwarded-For-Port

No

Boolean

Specifies whether to transparently transmit the source port of the client to backend servers. If X-Forwarded-For-Port is set to true, the source port of the client will be stored in the HTTP header and passed to backend servers.

X-Forwarded-Host

No

Boolean

Specifies whether to rewrite the X-Forwarded-Host header. If X-Forwarded-Host is set to true, X-Forwarded-Host in the request header from the clients can be set to Host in the request header sent from the load balancer to backend servers.

X-Forwarded-Proto

No

Boolean

If X-Forwarded-Proto is set to true, the listener protocol of the load balancer can be transferred to backend servers through the HTTP header of the packet.

X-Real-IP

No

Boolean

If X-Real-IP is set to true, the source IP address of the client can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-ELB-ID

No

Boolean

If X-Forwarded-ELB-ID is set to true, the load balancer ID can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-TLS-Certificate-ID

No

Boolean

If X-Forwarded-TLS-Certificate-ID is set to true, the certificate ID of the load balancer can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-TLS-Protocol

No

Boolean

If X-Forwarded-TLS-Protocol is set to true, the algorithm protocol of the load balancer can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-TLS-Cipher

No

Boolean

If X-Forwarded-TLS-Cipher is set to true, the algorithm suite of the load balancer can be transferred to backend servers through the HTTP header of the packet.

Table 6 Tag

Parameter

Mandatory

Type

Description

key

No

String

Specifies the tag key.

Minimum: 1

Maximum: 36

value

No

String

Specifies the tag value.

Minimum: 0

Maximum: 43

Table 7 CreateListenerIpGroupOption

Parameter

Mandatory

Type

Description

ipgroup_id

Yes

String

Specifies the ID of the IP address group associated with the listener.

  • If ip_list is set to an empty array [] and type to whitelist, no IP addresses are allowed to access the listener.

  • If ip_list is set to an empty array [] and type to blacklist, any IP address is allowed to access the listener.

Minimum: 1

Maximum: 3600

enable_ipgroup

No

Boolean

Specifies whether to enable access control.

  • true (default): Access control will be enabled.

  • false: Access control will be disabled.

type

No

String

Specifies how access to the listener is controlled.

  • white (default): A whitelist will be configured. Only IP addresses in the whitelist can access the listener.

  • black: A blacklist will be configured. IP addresses in the blacklist are not allowed to access the listener.

Table 8 CreateListenerQuicConfigOption

Parameter

Mandatory

Type

Description

quic_listener_id

Yes

String

Specifies the ID of the QUIC listener. Specifies the specified listener. The specified quic_listener_id must exist. The listener protocol must be QUIC and cannot be set to null, otherwise, it will conflict with enable_quic_upgrade.

enable_quic_upgrade

No

Boolean

Specifies whether to enable QUIC upgrade. True: QUIC upgrade is enabled. False (default): QUIC upgrade is disabled. HTTPS listeners can be upgraded to QUIC listeners.

Default: false

Response Parameters

Status code: 201

Table 9 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID. The value is automatically generated.

listener

Listener object

Specifies the listener.

Table 10 Listener

Parameter

Type

Description

admin_state_up

Boolean

Specifies the administrative status of the listener. The value can only be true.

This parameter is unsupported. Please do not use it.

client_ca_tls_container_ref

String

Specifies the ID of the CA certificate used by the listener. This parameter is available only when type is set to client.

connection_limit

Integer

Specifies the maximum number of connections that the load balancer can establish with backend servers. The value -1 indicates that the number of connections is not limited.

This parameter is unsupported. Please do not use it.

created_at

String

Specifies the time when the listener was created, in the format of yyyy-MM-dd''T''HH:mm:ss''Z'', for example, 2021-07-30T12:03:44Z.

default_pool_id

String

Specifies the ID of the default backend server group. If there is no matched forwarding policy, requests are forwarded to the default backend server.

default_tls_container_ref

String

Specifies the ID of the server certificate used by the listener.

description

String

Provides supplementary information about the listener.

http2_enable

Boolean

Specifies whether to use HTTP/2 if you want the clients to use HTTP/2 to communicate with the listener. However, connections between the load balancer and backend servers still use HTTP/1.x by default. Note:

  • This parameter is available only for HTTPS listeners.

  • You cannot configure this parameter for QUIC listeners, and the fixed value is true.

  • If you configure this parameter for listeners with other protocols, it will not take effect.

id

String

Specifies the listener ID.

insert_headers

ListenerInsertHeaders object

Specifies the HTTP header fields that can transmit required information to backend servers. For example, the X-Forwarded-ELB-IP header field can transmit the EIP of the load balancer to backend servers.

loadbalancers

Array of LoadBalancerRef objects

Specifies the ID of the load balancer that the listener is added to. A listener can be added to only one load balancer.

name

String

Specifies the listener name. Note: If you leave the listener name empty, you cannot locate it on the listener list and view its details.

project_id

String

Specifies the ID of the project where the listener is used.

protocol

String

Specifies the protocol used by the listener.

The value can be TCP, HTTP, UDP, HTTPS, TERMINATED_HTTPS, QUIC, or TLS.

Note:

  • Protocol used by HTTPS listeners added to a shared load balancer can only be set to TERMINATED_HTTPS. If HTTPS is passed, the value will be automatically changed to TERMINATED_HTTPS.

  • Protocol used by HTTPS listeners added to a dedicated load balancer can only be set to HTTPS. If TERMINATED_HTTPS is passed, the value will be automatically changed to HTTPS.

protocol_port

Integer

Specifies the port used by the listener. The QUIC listener port cannot be 4789 or the same as the UDP listener port. If this parameter is set to 0, port_ranges is required.

Minimum: 0

Maximum: 65535

sni_container_refs

Array of strings

Specifies the IDs of SNI certificates (server certificates with domain names) used by the listener.

Note:

  • The domain names of all SNI certificates must be unique.

  • The total number of domain names of all SNI certificates cannot exceed 50.

sni_match_algo

String

Specifies how wildcard domain name matches with the SNI certificates used by the listener.

longest_suffix indicates longest suffix match. wildcard indicates wildcard match.

The default value is wildcard.

tags

Array of Tag objects

Lists the tags.

updated_at

String

Specifies the time when the listener was updated, in the format of yyyy-MM-dd''T''HH:mm:ss''Z'', for example, 2021-07-30T12:03:44Z.

tls_ciphers_policy

String

Specifies the security policy used by the listener.

security_policy_id

String

Specifies the ID of the custom security policy.

enable_member_retry

Boolean

Specifies whether to enable health check retries for backend servers. The value can be true (enable health check retries) or false (disable health check retries). The default value is true. Note:

  • If a shared load balancer is associated, this parameter is available only when protocol is set to HTTP or TERMINATED_HTTPS.

  • If a dedicated load balancer is associated, this parameter is available only when protocol is set to HTTP, HTTPS, or QUIC.

keepalive_timeout

Integer

Specifies the idle timeout duration, in seconds. If there are no requests reaching the load balancer after the idle timeout duration elapses, the load balancer will disconnect the connection with the client and establish a new connection when there is a new request.

  • For TCP listeners, the value ranges from 10 to 4000, and the default value is 300.

  • For HTTP and HTTPS listeners, the value ranges from 1 to 4000, and the default value is 60.

  • For UDP listeners of shared load balancers, this parameter does not take effect.

client_timeout

Integer

Specifies the timeout duration for waiting for a response from a client, in seconds. There are two situations:

  • If the client fails to send a request header to the load balancer within the timeout duration, the request will be interrupted.

  • If the interval between two consecutive request bodies reaching the load balancer is greater than the timeout duration, the connection will be disconnected.

The value ranges from 1 to 300, and the default value is 60.

This parameter is available only for HTTP and HTTPS listeners.

member_timeout

Integer

Specifies the timeout duration for waiting for a response from a backend server, in seconds. If the backend server fails to respond after the timeout duration elapses, the load balancer will stop waiting and return HTTP 504 Gateway Timeout to the client.

The value ranges from 1 to 300, and the default value is 60.

This parameter is available only for HTTP and HTTPS listeners.

ipgroup

ListenerIpGroup object

Specifies the IP address group associated with the listener.

transparent_client_ip_enable

Boolean

Specifies whether to pass source IP addresses of the clients to backend servers.

proxy_protocol_enable

Boolean

Specifies whether to enable the ProxyProtocol option to pass the source IP addresses of the clients to backend servers. This parameter is available only for TLS listeners and does not take effect for other types of listeners.

enhance_l7policy_enable

Boolean

Specifies whether to enable advanced forwarding. If advanced forwarding is enabled, more flexible forwarding policies and rules are supported. The value can be true (enable advanced forwarding) or false (disable advanced forwarding), and the default value is false.

The following scenarios are supported:

  • action can be set to REDIRECT_TO_URL (requests will be redirected to another URL) or Fixed_RESPONSE (a fixed response body will be returned to clients).

  • Parameters priority, redirect_url_config, and fixed_response_config can be specified in a forwarding policy.

  • Parameter type can be set to METHOD, HEADER, QUERY_STRING, or SOURCE_IP for a forwarding rule.

  • If type is set to HOST_NAME for a forwarding rule, the value parameter of the forwarding rule supports wildcard asterisks (*).

  • The conditions parameter can be specified for forwarding rules.

Default: false

quic_config

ListenerQuicConfig object

Specifies the QUIC configuration for the current listener. This parameter is valid only when protocol is set to HTTPS.

For TCP, UDP, HTTP, QUIC listeners, if this parameter is not left blank, an error will be reported.

NOTE:

The client sends a normal HTTP request that contains information indicating that the QUIC protocol is supported.

If QUIC upgrade is enabled for the listeners, QUIC port and version information will be added to the response header.

When the client sends both HTTPS and QUIC requests to the server, if the QUIC request is successfully sent, QUIC protocol will be used for subsequent communications.

Table 11 ListenerInsertHeaders

Parameter

Type

Description

X-Forwarded-ELB-IP

Boolean

Specifies whether to transparently transmit the load balancer EIP to backend servers. If X-Forwarded-ELB-IP is set to true, the load balancer EIP will be stored in the HTTP header and passed to backend servers.

X-Forwarded-Port

Boolean

Specifies whether to transparently transmit the listening port of the load balancer to backend servers. If X-Forwarded-Port is set to true, the listening port of the load balancer will be stored in the HTTP header and passed to backend servers.

X-Forwarded-For-Port

Boolean

Specifies whether to transparently transmit the source port of the client to backend servers. If X-Forwarded-For-Port is set to true, the source port of the client will be stored in the HTTP header and passed to backend servers.

X-Forwarded-Host

Boolean

Specifies whether to rewrite the X-Forwarded-Host header. If X-Forwarded-Host is set to true, X-Forwarded-Host in the request header from the clients can be set to Host in the request header sent from the load balancer to backend servers.

X-Forwarded-Proto

Boolean

If X-Forwarded-Proto is set to true, the listener protocol of the load balancer can be transferred to backend servers through the HTTP header of the packet.

X-Real-IP

Boolean

If X-Real-IP is set to true, the source IP address of the client can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-ELB-ID

Boolean

If X-Forwarded-ELB-ID is set to true, the load balancer ID can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-TLS-Certificate-ID

Boolean

If X-Forwarded-TLS-Certificate-ID is set to true, the certificate ID of the load balancer can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-TLS-Protocol

Boolean

If X-Forwarded-TLS-Protocol is set to true, the algorithm protocol of the load balancer can be transferred to backend servers through the HTTP header of the packet.

X-Forwarded-TLS-Cipher

Boolean

If X-Forwarded-TLS-Cipher is set to true, the algorithm suite of the load balancer can be transferred to backend servers through the HTTP header of the packet.

Table 12 LoadBalancerRef

Parameter

Type

Description

id

String

Specifies the load balancer ID.

Table 13 Tag

Parameter

Type

Description

key

String

Specifies the tag key.

Minimum: 1

Maximum: 36

value

String

Specifies the tag value.

Minimum: 0

Maximum: 43

Table 14 ListenerIpGroup

Parameter

Type

Description

ipgroup_id

String

Specifies the ID of the IP address group associated with the listener.

This parameter is mandatory when you create the IP address group and is optional when you update the IP address group.

The specified IP address group must exist, and the value cannot be null.

enable_ipgroup

Boolean

Specifies whether to enable access control.

  • true: Access control is enabled.

  • false: Access control is disabled.

A listener with access control enabled can be directly deleted.

type

String

Specifies how access to the listener is controlled.

  • white: A whitelist is configured. Only IP addresses in the whitelist can access the listener.

  • black: A blacklist is configured. IP addresses in the blacklist are not allowed to access the listener.

Table 15 ListenerQuicConfig

Parameter

Type

Description

quic_listener_id

String

Specifies the ID of the QUIC listener. This parameter is mandatory for creation and is optional for update. The specified quic_listener_id must exist. The listener protocol must be QUIC and cannot be set to null, otherwise, it will conflict with enable_quic_upgrade.

enable_quic_upgrade

Boolean

Specifies whether to enable QUIC upgrade. True: QUIC upgrade is enabled. False: QUIC upgrade is disabled. HTTPS listeners can be upgraded to QUIC listeners.

Example Requests

  • Example 1: Adding a TCP listener

    POST https://{ELB_Endpoint}/v3/99a3fff0d03c428eac3678da6a7d0f24/elb/listeners
    
    {
      "listener" : {
        "protocol_port" : 80,
        "protocol" : "TCP",
        "loadbalancer_id" : "098b2f68-af1c-41a9-8efd-69958722af62",
        "name" : "My listener",
        "admin_state_up" : true,
        "insert_headers" : {
          "X-Forwarded-ELB-IP" : true
        }
      }
    }
  • Example 2: Adding an HTTPS listener

    POST https://{ELB_Endpoint}/v3/99a3fff0d03c428eac3678da6a7d0f24/elb/listeners
    
    {
      "listener" : {
        "protocol_port" : 90,
        "protocol" : "HTTPS",
        "loadbalancer_id" : "098b2f68-af1c-41a9-8efd-69958722af62",
        "name" : "My listener",
        "admin_state_up" : true,
        "ipgroup" : {
          "ipgroup_id" : "0416b6f1-877f-4a51-987e-978b3f083542",
          "type" : "black"
        },
        "security_policy_id" : "8722e0e0-9cc9-4490-9660-8c9a5732fbb0",
        "default_tls_container_ref" : "233a325e5e3e4ce8beeb320aa714cc12"
      }
    }

Example Responses

Status code: 201

Normal response to POST requests.

{
  "listener" : {
    "id" : "0b11747a-b139-492f-9692-2df0b1c87193",
    "name" : "My listener",
    "protocol_port" : 80,
    "protocol" : "TCP",
    "description" : null,
    "default_tls_container_ref" : null,
    "admin_state_up" : true,
    "loadbalancers" : [ {
      "id" : "098b2f68-af1c-41a9-8efd-69958722af62"
    } ],
    "client_ca_tls_container_ref" : null,
    "project_id" : "99a3fff0d03c428eac3678da6a7d0f24",
    "sni_container_refs" : [ ],
    "connection_limit" : -1,
    "member_timeout" : null,
    "client_timeout" : null,
    "keepalive_timeout" : null,
    "default_pool_id" : null,
    "ipgroup" : null,
    "tls_ciphers_policy" : "tls-1-0",
    "tags" : [ ],
    "created_at" : "2019-04-02T00:12:32Z",
    "updated_at" : "2019-04-02T00:12:32Z",
    "http2_enable" : false,
    "enable_member_retry" : true,
    "insert_headers" : {
      "X-Forwarded-ELB-IP" : true
    },
    "transparent_client_ip_enable" : false
  },
  "request_id" : "f4c4aca8-df16-42e8-8836-33e4b8e9aa8e"
}

Status Codes

Status Code

Description

201

Normal response to POST requests.

Error Codes

See Error Codes.