# Request Structure

## 1. Service Address

> The API supports access to the nearest region. Based on the client's location when calling the interface, it will automatically resolve to a server in the nearest region. The default domain name for proximity access to the SMS service is api.sms.scloudsg.com.

SMS service uses the following domain names as service access points:

| Access Region               | Domain                  | Remarks                                         |
| --------------------------- | ----------------------- | ----------------------------------------------- |
| Proximity Access 1 (Recommended) | api.sms.scloudsg.com | For latency-sensitive applications, it is recommended to use this domain name. Please confirm with technical support. |
| Proximity Access 2          | https://api.scloudsg.com              | Please confirm with technical support.          |

## 2. Communication Protocol

All APIs of the SCloud cloud computing product support communication via HTTP/HTTPS. To ensure high security in communication, it is recommended that you use the HTTPS protocol.

## 3. Request Method

Supported HTTP/HTTPS GET

## 4. Character Encoding

Requests and responses use UTF-8 character encoding.