// Bucket name, which consists of bucketname-appid (appid must be included), can be viewed in the COS console. https://console.tencentcloud.com/cos5/bucket
let bucket = "examplebucket-1250000000";
//The location identifier of an object in a bucket, also known as the object key
let cosPath = "exampleobject.txt"; 

let request = new HeadObjectRequest(bucket, cosPath);
try {
  let result = await CosXmlBaseService.default().headObject(request)
  // The result includes http headers. Headers starting with 'x-cos-meta-*' are the metadata of the Object.
} catch (e) {
  // Exception handling
}