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Configure an endpoint

Last Updated: May 27, 2022

This topic describes how to configure an endpoint in the Classic SDK.

An endpoint is a domain name of an Alibaba Cloud service API. For example, an endpoint of the Elastic Compute Service (ECS) API can be

If an endpoint cannot be retrieved, you must specify an endpoint. The Classic SDK provides four addressing modes for endpoints. The following list describes the addressing modes by priority in descending order:

  1. User-defined addressing mode: This mode is assigned the highest priority. In this mode, you can specify an exact endpoint.

// The mode globally takes effect.
IClientProfile profile = DefaultProfile.GetProfile("<regionId>", "<ACCESS_KEY_ID>", "<ACCESS_KEY_SECRET>");
profile.AddEndpoint("<endpointName>", "<regionId>", "<product>", "<domain>");

// The mode takes effect only on the current request.
DescribeRegionsRequest request = new DescribeRegionsRequest();

2. Concatenation-based addressing mode: In this mode, an endpoint is generated by concatenating data. This mode takes effect only when API requests are sent over a virtual private cloud (VPC) or the SDK for an Alibaba Cloud service uses an endpoint data file. For more information about an endpoint data file, visit ECS endpoint data file.

// Send an request over the Internet.
request.ProductNetwork = "public"; // The default value of the productNetwork parameter is public. You do not need to configure the parameter.

// Send a cross-origin request.
request.ProductNetwork = "share";

// Send an IPv6 request.
request.ProductNetwork = "ipv6";

// Send a request by using a proxy.
request.ProductNetwork = "proxy";

// Send a request over an internal network.
request.ProductNetwork = "inner";

// Send a request over a network that supports both IPv4 and IPv6.
request.ProductNetwork = "dualstack";

// Send a request over a VPC.
request.ProductNetwork = "vpc";