Description
During sendRequest the Client checks for the existence of a curl handle in the handle property.
If there is one, it calls curl_reset on it and continues with that handle.
The only way to destroy a curl handle is with the destructor of the Client.
The problem with this is how curl_resetworks.
This function is only resetting the options, but not the underlying socket.
From the curl manual
It does not change the following information kept in the handle: live connections, the Session ID cache, the DNS cache, the cookies and shares.
In long running scripts this leads to more and more open sockets in CLOSE_WAIT status.
Depending on the remote servers.
Until all allowed file descriptors are in use.
The workaround is to construct a new Client object for every request, so the destructor gets called when a request is finished.
A better way would be to explicitely close the handle with curl_close after each request and use a new one for the next request.