function getResponseHeader(request, bucket, dataBuffer, lastModified, log) {
    const corsHeaders = collectCorsHeaders(request.headers.origin,
        request.method, bucket);
    const responseMetaHeaders = collectResponseHeaders({
        'last-modified': lastModified || new Date().toISOString(),
        'content-md5': crypto
            .createHash('md5')
            .update(dataBuffer)
            .digest('hex'),
        'content-length': dataBuffer.byteLength,
        'content-type': 'text/xml',
    }, corsHeaders, null, false);
    responseMetaHeaders.versionId = 'null';
    responseMetaHeaders['x-amz-id-2'] = log.getSerializedUids();
    responseMetaHeaders['x-amz-request-id'] = log.getSerializedUids();
    return responseMetaHeaders;
}
Get response headers for the object
@param {object} request - incoming request
@param {BucketInfo} bucket - bucket
@param {string} dataBuffer - data to send as a buffer
@param {date} [lastModified] - last modified date of the value
@param {object} log - logging object
@returns {object} - response headers