func (s *BucketService) Head(ctx context.Context) (*Response, error)

package main

import (
        "context"
        "github.com/tencentyun/cos-go-sdk-v5"
        "net/http"
        "net/url"
        "os"
)

func main() {
        // Bucket name, composed of bucketname-appid, appid must be entered, and the bucket name can be viewed in the COS console. https://console.cloud.tencent.com/cos5/bucket
        // Replace with the user's region. The bucket region can be viewed in the COS console "Bucket Overview" at https://console.cloud.tencent.com/. For more information on regions, visit https://cloud.tencent.com/document/product/436/6224.
        u, _ := url.Parse("https://examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com")
        b := &cos.BaseURL{BucketURL: u}
        client := cos.NewClient(b, &http.Client{
                Transport: &cos.AuthorizationTransport{
                        // Get the key from environment variables
                        // The environment variable SECRETID represents the user's SecretId. To view the key, log in to the Access Management Console at https://console.cloud.tencent.com/cam/capi.
                        SecretID: os.Getenv("SECRETID"),  // User's SecretId, it is recommended to use a sub-account key, and follow the principle of least privilege to minimize usage risks. For obtaining a sub-account key, please refer to https://cloud.tencent.com/document/product/598/37140
                        // The environment variable SECRETKEY represents the user's SecretKey. To view the key, log in to the Access Management Console at https://console.cloud.tencent.com/cam/capi.
                        SecretKey: os.Getenv("SECRETKEY"),  // User's SecretKey, it is recommended to use a sub-account key and follow the principle of least privilege to reduce usage risks. For obtaining a sub-account key, please refer to https://cloud.tencent.com/document/product/598/37140
                },
        })

        _, err := client.Bucket.Head(context.Background())
        if err != nil {
                panic(err)
        }
}