Configuring CORS for a Bucket (SDK for Go)

package main
import (
    "fmt"
    "os"
    obs "github.com/huaweicloud/huaweicloud-sdk-go-obs/obs"
)
func main() {
    //Obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways. Using hard coding may result in leakage.
    //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
    ak := os.Getenv("AccessKeyID")
    sk := os.Getenv("SecretAccessKey")
    // (Optional) If you use a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding to reduce leakage risks. You can obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways.
    securityToken := os.Getenv("SecurityToken")
    // Enter the endpoint corresponding to the bucket. EU-Dublin is used here as an example. Replace it with the one currently in use.
    endPoint := "https://obs.eu-west-101.myhuaweicloud.eu" 
    // Create an obsClient instance.
    // If you use a temporary AK/SK pair and a security token to access OBS, use the obs.WithSecurityToken method to specify a security token when creating an instance.
    obsClient, err := obs.New(ak, sk, endPoint, obs.WithSecurityToken(securityToken))
    if err != nil {
        fmt.Printf("Create obsClient error, errMsg: %s", err.Error())
    }
    input := &obs.SetBucketCorsInput{}
    // Specify a bucket name.
    input.Bucket = "examplebucket"
    // Specify CORS rules.
    input.CorsRules = []obs.CorsRule{
        {
            ID:            "rule1",
            AllowedOrigin: []string{"http://www.a.com", "http://www.b.com"},
            AllowedMethod: []string{"GET", "PUT"},
            AllowedHeader: []string{"header1", "header2"},
            MaxAgeSeconds: 1000,
            ExposeHeader:  []string{"obs-1", "obs-2"},
        },
        {
            ID:            "rule2",
            AllowedOrigin: []string{"http://www.c.com", "http://www.d.com"},
            AllowedMethod: []string{"GET", "POST"},
            AllowedHeader: []string{"header3", "header4"},
            MaxAgeSeconds: 1000,
        },
    }
    // Configure CORS for the bucket.
    output, err := obsClient.SetBucketCors(input)
    if err == nil {
        fmt.Printf("Set bucket(%s) CORS configuration successful!\n", input.Bucket)
        fmt.Printf("RequestId:%s\n", output.RequestId)
        return
    }
    fmt.Printf("Set bucket(%s) CORS configuration fail!\n", input.Bucket)
    if obsError, ok := err.(obs.ObsError); ok {
        fmt.Println("An ObsError was found, which means your request sent to OBS was rejected with an error response.")
        fmt.Println(obsError.Error())
    } else {
        fmt.Println("An Exception was found, which means the client encountered an internal problem when attempting to communicate with OBS, for example, the client was unable to access the network.")
        fmt.Println(err)
    }
}