public boolean skipClientSideValidationPerUploadPartResponse(ObjectMetadata metadata) {
        return skipClientSideValidationPerPutResponse(metadata);
    }
Determines whether the client should use the {@link Headers#ETAG} header returned by S3 to
validate the integrity of the message client side based on the server response. We skip the
client side check if any of the following conditions are true:
<ol>
<li>The system property {@value #DISABLE_PUT_OBJECT_MD5_VALIDATION_PROPERTY} is set</li>
<li>The request involves SSE-C or SSE-KMS</li>
<li>The Etag header is missing</li>
</ol>

@return True if client side validation should be skipped, false otherwise.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/internal/SkipMd5CheckStrategy.java