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Interface for a general purpose HEAD accessor, for a resource stored in a single server; one accessor per server and end point.
 public interface ContentHeader<K extends EntryKey>
Method to call to try to make a single HEAD call to specified server node.

config Configuration settings to use for call
endOfTime Time point at which the whole operation will time out
contentId Key of content to access
    public HeadCallResult tryHead(CallConfig configlong endOfTime, K contentId);
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