const float URL_READY_ERROR    = -1;
const float URL_READY_CLOSED   =  0;
const float URL_READY_CANWRITE =  1;
const float URL_READY_CANREAD  =  2;
// errors: -1, or negative HTTP status code
typedef void(entity handle, entity pass, float status) url_ready_func;

void url_single_fopen(string url, float mode, url_ready_func rdy, entity pass);
void url_fclose(entity e);
string url_fgets(entity e);
void url_fputs(entity e, string s);

// returns true if handled
float url_URI_Get_Callback(float id, float status, string data);
#define MIN_URL_ID URI_GET_URLLIB
#define NUM_URL_ID (URI_GET_URLLIB_END - URI_GET_URLLIB + 1)

void url_multi_fopen(string url, float mode, url_ready_func rdy, entity pass);