@Deprecated
    public void setRequestCredentials(AWSCredentials credentials) {
        this.credentialsProvider = credentials == null ? null : new StaticCredentialsProvider(credentials);
    }
Sets the optional credentials to use for this request, overriding the default credentials set at the client level.

@param credentials The optional AWS security credentials to use for this request, overriding the default credentials set at
                   the client level.
@deprecated by {@link #setRequestCredentialsProvider(AWSCredentialsProvider)}. If you must use {@link AWSCredentials} you
can wrap it with a {@link com.amazonaws.auth.AWSStaticCredentialsProvider}.
aws-java-sdk-core/src/main/java/com/amazonaws/AmazonWebServiceRequest.java