php版微信支付api.mch.weixin.qq.com域名解析慢原因与解决方法

[root@01 tmp]# wget api.mch.weixin.qq.com
--2016-06-18 14:51:03-- http://api.mch.weixin.qq.com/
Resolving api.mch.weixin.qq.com...

[root@01 tmp]# wget -4 api.mch.weixin.qq.com
--2016-06-18 17:03:52-- http://api.mch.weixin.qq.com/
Resolving api.mch.weixin.qq.com... 123.151.71.149, 123.151.79.109
Connecting to api.mch.weixin.qq.com|123.151.71.149|:80... connected.

#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <iostream>
#include <sys/types.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
using namespace std;
int main() {
  struct addrinfo hints,*answer,*curr,*p;
  int error;
  memset(&hints, 0, sizeof hints);
  hints.ai_family = AF_INET6;//AF_UNSPEC; // use AF_INET6 to force IPv6
  hints.ai_socktype = SOCK_STREAM;//SOCK_DGRAM; // SOCK_STREAM
  if ((error = getaddrinfo("api.mch.weixin.qq.com", NULL, &hints, &answer)) != 0) {
    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(error));
    return 1;
  } else cout <<"Success with a URL\n";
  char ipstr[16];
  for (curr = answer; curr != NULL; curr = curr->ai_next) {
    inet_ntop(AF_INET,&(((struct sockaddr_in *)(curr->ai_addr))->sin_addr),ipstr, 16);
    printf("%s\n", ipstr);
  }
  freeaddrinfo(answer);
  return 0;
}

dig @ns-tel1.qq.com weixin.qq.com AAAA
weixin.qq.com.    43200  IN  SOA ns-tel1.qq.com. webmaster.qq.com. 1293502040 300 600 86400 300