val body = new MultipartBody.Builder()
    .setType(MultipartBody.FORM)
    .addFormDataPart("key", data.fileName)
    .addFormDataPart("acl", "public-read")
    .addFormDataPart("Content-Type", data.contentType)
    .addFormDataPart("X-Amz-Credential", data.amzCredential)
    .addFormDataPart("X-Amz-Algorithm", "AWS4-HMAC-SHA256")
    .addFormDataPart("X-Amz-Date", data.amzDate)
    .addFormDataPart("X-Amz-Signature", data.amzSignature)
    .addFormDataPart("Policy", data.encodedPolicy)


    .addFormDataPart("file", data.fileName,
      RequestBody.create(MediaType.parse(data.contentType), file))
    .build()

  val request = new Request.Builder()
    .url(data.url)
    .post(body)
    .build()