Removing Bucket Name as Subdomain when Using AmazonS3Client Android Library

On a simple java desktop app, uploading an image to an S3-compliant API service is so simple. Each bucket are represented as folders, therefore no special approach is needed. Here is how it was done,

public AWSTestCase() {
	AwsClientBuilder.EndpointConfiguration endpoint = new AwsClientBuilder.EndpointConfiguration("http://localhost:8082/", "us-west-2");
	client = AmazonS3ClientBuilder.standard()
			.withCredentials(new AWSStaticCredentialsProvider(new AnonymousAWSCredentials()))
			.withClientConfiguration(new ClientConfiguration().withProtocol(Protocol.HTTP))

public void testUploadToBucket() {
	client.putObject("bucket01", "jim.png", new File("d:\\jim.png"));

It will try to upload to below url,


But the same approach is not working on Android,

File file = new File(Environment.getExternalStorageDirectory(), attachmentModel.getLocalPath());

AWSCredentials credentials = new BasicAWSCredentials(ConstantCommon.ACCESS_KEY, ConstantCommon.SECRET_KEY);
ClientConfiguration clientConfig = new ClientConfiguration();

AmazonS3Client client = new AmazonS3Client(credentials, clientConfig);
client.putObject("bucket01", attachmentModel.getRemotePath(), file);

It will gives error,

com.amazonaws.AmazonClientException: Unable to execute HTTP request: bucket01.localhost

Somehow app will try to upload to below url, because bucket name are treated as subdomain.


Workaround is quite easy, setting bucket name as empty string and set bucket name as folder on endpoint should solve this issue.

public AWSTestCase() {
	client = new AmazonS3Client(new AnonymousAWSCredentials());

public void testUploadToBucket() {
	client.putObject("", "jim.png", new File("d:\\jim.png"));

The content of my Gradle file,

    implementation 'com.amazonaws:aws-android-sdk-s3:2.9.2'
    implementation 'com.amazonaws:aws-android-sdk-core:2.16.5'

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