Listener Overview

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Terakhir diperbarui: 2026-09-04 16:28:43

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After creating a GA instance, you need to configure a listener for it. The listener listens for connection requests from clients and distributes client traffic to backend endpoints based on the forwarding policy you configured.
Configuring a listener typically involves the following three parts:
1. Listener protocol and listening port: The listening port, also known as the frontend port, is the port through which GA receives client requests and forwards them to the backend.
2. Listening policy: controls forwarding behaviors such as session persistence and connection idle timeout.
3. Endpoint group: Create an endpoint group and add endpoints to it to receive traffic forwarded by the listener.
Supported Protocol Types
GA2.0 can listen to layer-4 and layer-7 requests from clients and distributes them to backend endpoints, which then handle the requests. The difference between a layer-4 and a layer-7 listener lies in whether a layer-4 protocol or a layer-7 protocol is used to forward traffic when a client request arrives.
Layer-4 protocol: Transport layer protocols include TCP and UDP, and primarily receive requests through VIP + Port and distribute traffic to backend servers.
Layer-7 protocol: Application layer protocols include HTTP and HTTPS, and traffic is distributed based on application layer information such as URL and HTTP headers.
Protocol Category
Protocol
Description
Scenario
Layer-4 protocol
TCP
Connection-oriented and reliable transport layer protocol. A connection must be established through a three-way handshake before data transmission. It supports session persistence based on client IP address (source IP address) and can obtain the client source IP address.
It is suitable for scenarios that require high reliability and data accuracy but have lower requirements for transmission speed, such as file transfer, email sending and receiving, and remote login. For details, see Configuring UDP and TCP Listeners.
Layer-4 protocol
UDP
Connectionless transport layer protocol. No connection needs to be established or maintained before data transmission. It supports one-to-one, one-to-many, many-to-one, and many-to-many interactive communication, as well as session persistence based on client IP address (source IP address).
It is suitable for scenarios that require high transmission efficiency but have relatively lower accuracy requirements, such as instant messaging and online video. For details, see Configuring UDP and TCP Listeners.
Layer-7 protocol
HTTP
Application layer protocol that supports forwarding based on request domain name and URL.
It is suitable for applications that require identification of request content, such as Web applications and App services. For details, see Configuring HTTP and HTTPS Listeners.
Layer-7 protocol
HTTPS
Encrypted application layer protocol that supports forwarding based on request domain name and URL. It provides a unified certificate management service, allows certificate upload and replacement in the GA2.0 console, and supports one-way and mutual authentication.
It is suitable for HTTP applications that require encrypted transmission. For details, see Configuring HTTP and HTTPS Listeners.
Supported Port Ranges
Port Type
Description
Limit
Listening port (frontend port)
Port on which Global Acceleration receives requests and forwards them to endpoint nodes.
The configurable range is 1-65499.
Within the same global acceleration instance: listener ports of UDP protocols can overlap with those of TCP protocols. For example, you can create both a TCP:80 listener and a UDP:80 listener at the same time.
Listener ports cannot be duplicated under the same protocol type. TCP, TCP SSL, HTTP, and HTTPS all belong to the TCP protocol type. For example, you cannot create both a TCP:80 listener and an HTTP:80 listener at the same time.
Endpoint port (backend port)
Port on which the backend server provides services, used to receive and process traffic from Global Acceleration. Layer-7 listeners support endpoint port configuration.
The configurable range is 1-65499.
Within the same global acceleration instance, service ports of different listener protocols can overlap. For example, the HTTP:80 listener and HTTPS:443 listener can be bound to the same port on the same backend server at the same time.
Health check port
Port on which Global Acceleration sends probe requests to backend servers to check whether the servers are running normally. If the port responds normally, the server is considered healthy.
The configurable range is 1-65499.
References
Configuring UDP and TCP Listeners.
Configuring HTTP and HTTPS Listeners
Endpoint Group
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Global Accelerator 2.0

Listener Overview

Supported Protocol Types

Supported Port Ranges

References

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Protocol Category	Protocol	Description	Scenario
Layer-4 protocol	TCP	Connection-oriented and reliable transport layer protocol. A connection must be established through a three-way handshake before data transmission. It supports session persistence based on client IP address (source IP address) and can obtain the client source IP address.	It is suitable for scenarios that require high reliability and data accuracy but have lower requirements for transmission speed, such as file transfer, email sending and receiving, and remote login. For details, see Configuring UDP and TCP Listeners.
Layer-4 protocol	UDP	Connectionless transport layer protocol. No connection needs to be established or maintained before data transmission. It supports one-to-one, one-to-many, many-to-one, and many-to-many interactive communication, as well as session persistence based on client IP address (source IP address).	It is suitable for scenarios that require high transmission efficiency but have relatively lower accuracy requirements, such as instant messaging and online video. For details, see Configuring UDP and TCP Listeners.
Layer-7 protocol	HTTP	Application layer protocol that supports forwarding based on request domain name and URL.	It is suitable for applications that require identification of request content, such as Web applications and App services. For details, see Configuring HTTP and HTTPS Listeners.
Layer-7 protocol	HTTPS	Encrypted application layer protocol that supports forwarding based on request domain name and URL. It provides a unified certificate management service, allows certificate upload and replacement in the GA2.0 console, and supports one-way and mutual authentication.	It is suitable for HTTP applications that require encrypted transmission. For details, see Configuring HTTP and HTTPS Listeners.

Port Type	Description	Limit
Listening port (frontend port)	Port on which Global Acceleration receives requests and forwards them to endpoint nodes.	The configurable range is 1-65499. Within the same global acceleration instance: listener ports of UDP protocols can overlap with those of TCP protocols. For example, you can create both a TCP:80 listener and a UDP:80 listener at the same time. Listener ports cannot be duplicated under the same protocol type. TCP, TCP SSL, HTTP, and HTTPS all belong to the TCP protocol type. For example, you cannot create both a TCP:80 listener and an HTTP:80 listener at the same time.
Endpoint port (backend port)	Port on which the backend server provides services, used to receive and process traffic from Global Acceleration. Layer-7 listeners support endpoint port configuration.	The configurable range is 1-65499. Within the same global acceleration instance, service ports of different listener protocols can overlap. For example, the HTTP:80 listener and HTTPS:443 listener can be bound to the same port on the same backend server at the same time.
Health check port	Port on which Global Acceleration sends probe requests to backend servers to check whether the servers are running normally. If the port responds normally, the server is considered healthy.	The configurable range is 1-65499.