// errors: -1, or negative HTTP status code
typedef void(entity handle, entity pass, float status) url_ready_func;
-void url_fopen(string url, float mode, url_ready_func rdy, entity pass);
+void url_single_fopen(string url, float mode, url_ready_func rdy, entity pass);
void url_fclose(entity e, url_ready_func rdy, entity pass);
string url_fgets(entity e);
void url_fputs(entity e, string s);