extern bool send_request(struct connection_t *, const char *, ...) __attribute__ ((__format__(printf, 2, 3)));
extern void forward_request(struct connection_t *, const char *);
extern bool receive_request(struct connection_t *, const char *);
extern bool send_request(struct connection_t *, const char *, ...) __attribute__ ((__format__(printf, 2, 3)));
extern void forward_request(struct connection_t *, const char *);
extern bool receive_request(struct connection_t *, const char *);