If you develop HTTP services for internal network communication, staging environments, or development environments, and the HTTP services do not require encryption, you can add an HTTP listener to your Edge Load Balancer (ELB) instance to forward HTTP requests.
Prerequisites
An ELB instance is created. For more information, see Create an ELB instance.
Procedure
Log on to the ENS console.
On the ELB Instance page, find the ELB instance that you want to manage and click Listener Configuration in the Actions column.
On the Listener tab, click Add Listener.
Configure the parameters. The following table describes the parameters.
Parameter
Description
Listener Name
Specify a name for the listener.
ELB Protocol
Select HTTP.
Listener Port
Specify a listening port that is used by ELB to receive requests and forward the requests to backend servers. Valid values: 1 to 65535.
NoteWe recommend that you use port 80 for HTTP.
Advanced Settings
NoteClick Modify to configure the advanced settings.
Scheduling Algorithm
Weighted Round-Robin (WRR): Backend servers that have higher weights receive more requests than backend servers that have lower weights.
Weighted Least Connections (WLC): Requests are distributed based on the combination of the weights and active connections of backend servers. If multiple backend servers have the same weight, requests are forwarded to the backend server that has the least number of connections.
Round-Robin (RR): Requests are distributed to backend servers in sequence.
Redirection
Specify whether to redirect traffic from an HTTP listener to an HTTPS listener.
NoteBefore you enable redirection, make sure that an HTTPS listener is created. For more information, see Configure an HTTPS listener.
Idle Connection Timeout Period
If no request is received within the specified timeout period, ELB closes the connection. When a request is received, ELB establishes a new connection. Valid values: 1 to 60. Unit: seconds.
Connection Request Timeout Period
If the backend server does not respond within the timeout period, ELB returns the HTTP 504 error code to the client.
Valid values: 1 to 180.
Unit: seconds.
Obtain Client IP Address
Specify whether to retrieve the IP addresses of clients. Only Layer 4 listeners support this feature. By default, this feature is enabled.
Click Next, and configure health checks. For more information, see Configure health checks.
After you configure health checks, click Next. Confirm the settings and click Create.
On the Listener tab, find the listener that you want to enable and click Enable in the Actions column.