libcurl acting differently to curl.exe

[Josh]

The POST C code was:

/********* Sample code generated by the curl command line tool 
**********
  * All curl_easy_setopt() options are documented at:
  * https://curl.haxx.se/libcurl/c/curl_easy_setopt.html
  
************************************************************************/
#include <curl/curl.h>

int main(int argc, char *argv[])
{
   CURLcode ret;
   CURL *hnd;

   hnd = curl_easy_init();
   curl_easy_setopt(hnd, CURLOPT_BUFFERSIZE, 102400L);
   curl_easy_setopt(hnd, CURLOPT_URL, "https://foo.com/logon.php");
   curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, 
"username=user&password=pass&Logon=submit");
   curl_easy_setopt(hnd, CURLOPT_POSTFIELDSIZE_LARGE, 
(curl_off_t)52);
   curl_easy_setopt(hnd, CURLOPT_USERAGENT, "curl/7.57.0");
   curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L);
   curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, 
(long)CURL_HTTP_VERSION_2TLS);
   curl_easy_setopt(hnd, CURLOPT_CAINFO, 
"C:\\Users\\Josh\\Downloads\\curl-7.57.0-win64-mingw\\bin\\curl-ca-bundle.crt");
   curl_easy_setopt(hnd, CURLOPT_SSH_KNOWNHOSTS, 
"C:\\Users\\Josh\\AppData\\Roaming/_ssh/known_hosts");
   curl_easy_setopt(hnd, CURLOPT_COOKIEFILE, "cookie.dat");
   curl_easy_setopt(hnd, CURLOPT_COOKIEJAR, "cookie.dat");
   curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
   curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L);

   /* Here is a list of options the curl code used that cannot get 
generated
      as source easily. You may select to either not use them or 
implement
      them yourself.

   CURLOPT_WRITEDATA set to a objectpointer
   CURLOPT_INTERLEAVEDATA set to a objectpointer
   CURLOPT_WRITEFUNCTION set to a functionpointer
   CURLOPT_READDATA set to a objectpointer
   CURLOPT_READFUNCTION set to a functionpointer
   CURLOPT_SEEKDATA set to a objectpointer
   CURLOPT_SEEKFUNCTION set to a functionpointer
   CURLOPT_ERRORBUFFER set to a objectpointer
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
   CURLOPT_HEADERFUNCTION set to a functionpointer
   CURLOPT_HEADERDATA set to a objectpointer

   */

   ret = curl_easy_perform(hnd);

   curl_easy_cleanup(hnd);
   hnd = NULL;

   return (int)ret;
}
/**** End of sample code ****/