cURL reconnect to the same url - c++

Question

When I'm trying to connect to a new url I need to run the program with the new url, the program fails to connect and when I restart the program it will connect.
So what I'm trying to do is reset, all connections and instead of restarting the program just try to connect to the url once and then reset the connection and reconnecting, causing the same effect as restarting the program.
Is there any way to do that? And what causes my program to not load a new url? And forcing me to restart the program to make it work?
Here is my code:
#include <iostream>
#include <curl/curl.h>
#include <string>
#include <fstream>
static size_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
((std::string*)userp)->append((char*)contents, size * nmemb);
return size * nmemb;
}
int main(void)
{
std::ofstream file("source.txt");
CURL *curl;
CURLcode res = CURL_LAST;
std::string readBuffer;
curl = curl_easy_init();
while (curl && res != CURLE_OK){
curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/");
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, true);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 5);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 5);
curl_easy_setopt(curl, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)");
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
if (res != CURLE_OK)
curl = curl_easy_init();
}
file << readBuffer;
file.close();
std::cout << readBuffer << std::endl;
std::cin.ignore();
return 0;
}
Here I'm trying to use a while loop to reconnect and trying to use curl_easy_init() to reset the connection