get contentMD5() {
        return this.originalResponse.contentMD5;
    }
If the file has an MD5 hash and the
request is to read the full file, this response header is returned so that
the client can check for message content integrity. If the request is to
read a specified range and the 'x-ms-range-get-content-md5' is set to
true, then the request returns an MD5 hash for the range, as long as the
range size is less than or equal to 4 MB. If neither of these sets of
conditions is true, then no value is returned for the 'Content-MD5'
header.

@readonly