get http headers from socket

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, const char *argv[])
{
  char buffer[1024] = {0};
  int sockfd = 0;
  struct sockaddr_in server_info;
  int num = 0;
  char request[1024] = {"GET / HTTP/1.0\r\n\r\n"};

  if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
      perror("socket error");
      return -1;
    }

  server_info.sin_family = AF_INET;
  server_info.sin_addr.s_addr = inet_addr("127.0.0.1");
  server_