Thanks Daniel! This explains a lot in my tests.
After reading the docs more I see:
SYNOPSIS
#include <curl/curl.h>
CURL *curl_easy_init( );
DESCRIPTION
This function must be the first function to call, and it returns a CURL
easy handle that you must use as input to other functions in the easy
interface. This call MUST have a corresponding call to
curl_easy_cleanup(3) when the operation is complete.
If you did not already call curl_global_init(3), curl_easy_init(3) does
it automatically. This may be lethal in multi-threaded cases, since
curl_global_init(3) is not thread-safe, and it may result in resource
problems because there is no corresponding cleanup.
You are strongly advised to not allow this automatic behavior, by call‐
ing curl_global_init(3) yourself properly. See the description in
libcurl(3) of global environment requirements for details of how to use
this function.
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