struct env_var *(*get_process_vars)(struct client *cl, struct path_info *pi);
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);
int (*urlencode)(char *buf, int blen, const char *src, int slen);