// The bucket region can be viewed on the specified bucket's overview page in the COS console at https://console.tencentcloud.com/cos5/bucket/, for details about regions, see https://www.tencentcloud.com/document/product/436/6224?from_cn_redirect=1
let region = "ap-beijing"; // your bucket region
// 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 commonHeaderKey = "commonexamplekey"; // custom common Header key
let commonHeaderValue = "commonexamplevalue"; // custom common Header value
let requestHeaderKey = "requestexamplekey"; // custom request Header key
let requestHeaderValue = "requestexamplevalue"; // custom request Header value

// COS service configuration
let cosXmlServiceConfig = new CosXmlServiceConfig(region);
// Add a common custom Header to all requests
cosXmlServiceConfig.headers = new Map();
cosXmlServiceConfig.headers.set(commonHeaderKey, commonHeaderValue);
 
// Add a custom Header to a single request, which has higher priority than the common Header
let request = new HeadObjectRequest(bucket, cosPath);  
request.addHeader(requestHeaderKey, requestHeaderValue);

// Instantiate the COS service cosXmlBaseService
let cosXmlBaseService = new CosXmlBaseService(context, cosXmlServiceConfig, credential);
try {
  let result = await cosXmlBaseService.headObject(request)
} catch (e) {
  // Exception handling
}