code: public Blob createBlobFromByteArray(String bucketName, String blobName) {
      // [START createBlobFromByteArray]
      BlobId blobId = BlobId.of(bucketName, blobName);
      BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setContentType("text/plain").build();
      Blob blob = storage.create(blobInfo, "Hello, World!".getBytes(UTF_8));
      // [END createBlobFromByteArray]
      return blob;
    }
docs: [VARIABLE "my_blob_name"]