Configuring a CORS Rule (SDK for Java)

import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.BucketCors;
import com.obs.services.model.BucketCorsRule;
import com.obs.services.model.DeleteObjectsRequest;
import com.obs.services.model.DeleteObjectsResult;
import com.obs.services.model.KeyAndVersion;
import java.util.ArrayList;
import java.util.List;
public class SetBucketCors001 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. EU-Dublin is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.eu-west-101.myhuaweicloud.eu"; 
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            //Configure CORS rules.
            BucketCors cors = new BucketCors();
            List<BucketCorsRule> rules = new ArrayList<BucketCorsRule>();
            BucketCorsRule rule = new BucketCorsRule();
            ArrayList<String> allowedOrigin = new ArrayList<String>();
            // Specify the origin of the cross-origin request.
            allowedOrigin.add( "http://www.a.com");
            allowedOrigin.add( "http://www.b.com");
            rule.setAllowedOrigin(allowedOrigin);
            ArrayList<String> allowedMethod = new ArrayList<String>();
            // Specify the request method, which can be GET, PUT, DELETE, POST, or HEAD.
            allowedMethod.add("GET");
            allowedMethod.add("HEAD");
            allowedMethod.add("PUT");
            rule.setAllowedMethod(allowedMethod);
            ArrayList<String> allowedHeader = new ArrayList<String>();
            // Specify whether headers specified in Access-Control-Request-Headers in the OPTIONS request can be used.
            allowedHeader.add("x-obs-header");
            rule.setAllowedHeader(allowedHeader);
            ArrayList<String> exposeHeader = new ArrayList<String>();
            // Specify response headers that users can access using application programs.
            exposeHeader.add("x-obs-expose-header");
            rule.setExposeHeader(exposeHeader);
            // Specify the browser's cache time of the returned results of OPTIONS requests for specific resources, in seconds.
            rule.setMaxAgeSecond(10);
            rules.add(rule);
            cors.setRules(rules);
            obsClient.setBucketCors("examplebucket", cors);
            System.out.println("setBucketCors successfully");
        } catch (ObsException e) {
            System.out.println("setBucketCors failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("setBucketCors failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}