char *getheader(struct hthead *head, char *name);
void headpreheader(struct hthead *head, const char *name, const char *val);
void headappheader(struct hthead *head, const char *name, const char *val);
char *getheader(struct hthead *head, char *name);
void headpreheader(struct hthead *head, const char *name, const char *val);
void headappheader(struct hthead *head, const char *name, const char *val);