AWS credentials provider chain that looks for credentials in this order:
 
   - Environment Variables -
      
AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
      (RECOMMENDED since they are recognized by all the AWS SDKs and CLI except for .NET),
      or AWS_ACCESS_KEY and AWS_SECRET_KEY (only recognized by Java SDK)
    
   - Java System Properties - aws.accessKeyId and aws.secretKey
 
   - Web Identity Token credentials from the environment or container
 
   - Credential profiles file at the default location (~/.aws/credentials) shared by all AWS SDKs and the AWS CLI
 
   - Credentials delivered through the Amazon EC2 container service if AWS_CONTAINER_CREDENTIALS_RELATIVE_URI" environment variable is set
   and security manager has permission to access the variable,
 
   - Instance profile credentials delivered through the Amazon EC2 metadata service