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    void Ns_SetTrunc(
    Ns_Set *set,
    int size
    );
The Ns_SetTrunc function reduces the set to the first size key-value pairs and frees the memory for the rest of the key-value pairs that may have been in the set.
    	/* Eliminate the headers sent by a browser. */
    	Ns_SetTrunc(conn->headers, 0);