This topic provides an overview of listeners. After you create a Classic Load Balancer (CLB) instance, you must configure one or more listeners for it. A listener checks for connection requests and then distributes the requests to backend servers based on the forwarding rules that are defined by a specified scheduling algorithm.
CLB provides Layer 4 (TCP or UDP) and Layer 7 (HTTP or HTTPS) listeners. The following table lists the features and use cases of these listeners.
For more information, see Add a TCP listener.
Applicable to scenarios where real-time transmission is more important than reliability, such as video chats and real-time financial market pushes.
For more information, see Add a UDP listener.
Applicable to scenarios that require data content identification, such as web applications and small mobile games.
For more information, see Add an HTTP listener.
Applicable to scenarios that require encrypted transmission.
For more information, see Add an HTTPS listener.