multi:SetOpt_MaxConnects(max)
By setting this option, you can prevent the cache size from growing beyond the limit get by you.
When the cache is full, curl closes the oldest one in the cache to prevent the number of open connections from increasing.
This option is for the multi handle's use only, when using the easy interface
you should instead use the #CURLOPT_MAXCONNECTS
option.
See #CURLMOPT_MAX_TOTAL_CONNECTIONS
for limiting the number of active
connections.