HEAD Object

You can call ObsClient.HeadObject to check whether a specified object exists.

The example code is as follows:

// Initialize configuration parameters.
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// Create an instance of ObsClient.
ObsClient client = new ObsClient(accessKey, secretKey, config);
// Check whether the specified object exists.
try
{
    HeadObjectRequest request = new HeadObjectRequest()
    {
        BucketName = "bucketName",
        ObjectKey = "objectKey"
    };
    bool response = client.HeadObject(request);
    Console.WriteLine("Head object response: {0}", response);
}
catch (ObsException ex)
{
    Console.WriteLine("Exception errorcode: {0}, when head object.", ex.ErrorCode);
    Console.WriteLine("Exception errormessage: {0}", ex.ErrorMessage);
}

• If an exception is thrown and the returned HTTP status code is 404, the bucket does not exist.