2. For TXT record, it seems you split it into multiple records, and put each 
key/value pair into a different record. This is not necessary.

[Qin]: can multiple records be carried in one DNS message?

In addition, per RFC 6763, the key should not be more than 9 character long, 
and no space should be used in key, unless it's really necessary.

[Qin]: RFC1464 also defines the format of key/value pair that is carried in TXT 
record.
Per RFC1464, "less than 9 character long" restriction is not applied to the 
attribute name. The attribute name is equivalent to key described in RFC6763.
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