Get the values of all the specified keys. If one or more keys don't exist or is not of type
string, a 'nil' value is returned instead of the value of the specified key, but the operation
never fails.
<p>
Time complexity: O(1) for every key
@param keys
@return Multi bulk reply
Get the values of all the specified keys. If one or more keys don't exist or is not of type string, a 'nil' value is returned instead of the value of the specified key, but the operation never fails. <p> Time complexity: O(1) for every key @param keys @return Multi bulk reply