extern size_t add_to_iob(struct client_state *csp, char *buf, size_t n);
extern char *get_header(struct client_state *csp);
extern char *get_header_value(const struct list *header_list, const char *header_name);
extern size_t add_to_iob(struct client_state *csp, char *buf, size_t n);
extern char *get_header(struct client_state *csp);
extern char *get_header_value(const struct list *header_list, const char *header_name);