void (*cb)(struct client *cl, struct path_info *pi, char *url));
struct env_var *(*get_process_vars)(struct client *cl, struct path_info *pi);
+ void (*http_header)(struct client *cl, int code, const char *summary);
void (*client_error)(struct client *cl, int code, const char *summary, const char *fmt, ...);
void (*request_done)(struct client *cl);
void (*chunk_write)(struct client *cl, const void *data, int len);