@Override
                public void run() {
                    try {
                        eTag.set(blobStore.completeMultipartUpload(mpu, parts));
                    } catch (RuntimeException re) {
                        exception.set(re);
                    }
                }
Map XML ACLs to a canned policy if an exact tranformation exists.
src/main/java/org/gaul/s3proxy/S3ProxyHandler.java