> This program is capable of sending the message to the server and of 
> collecting the response from it, but as it is written, it sends the message 
> twice to the server, despite the fact that in the C ++ code it is only being 
> sent once (it must be something that the libcurl library does independently 
> of the C ++ program).



You do perform 2 requests in your code.
Sending request and reading response are not two separate operations. Set all 
the options before the first curl_easy_perform() and skip the second one.
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