Query the server for a supported feature, and returns its values (if any). Caches the parsed response to avoid resending the command repeatedly.
@return if the feature is present, returns the feature values (empty array if none)Returns {@code null} if the feature is not found or the command failed.Check {@link #getReplyCode()} or {@link #getReplyString()} if so.
@throws IOException
@since 3.0
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