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    void Ns_ConnCondSetHeaders(
    Ns_Conn *conn,
    char *field,
    char *value
    );
The Ns_ConnCondSetHeaders function sets the value of a field if and only if the field/value pair does not already exist. The search for an existing field is not case sensitive.
    	/* Set a Cookie header if not already set. */
    	Ns_ConnCondSetHeaders(conn, "Cookie", "randomStuff");