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       curl_easy_perform - Perform a file transfer


       #include <curl/curl.h>

       CURLcode curl_easy_perform(CURL *handle);


       This  function is called after the init and all the curl_easy_setopt(3)
       calls are made, and will perform  the  transfer  as  described  in  the
       options.   It  must  be  called  with  the  same handle as input as the
       curl_easy_init call returned.

       You can do any amount of calls to curl_easy_perform(3) while using  the
       same handle. If you intend to transfer more than one file, you are even
       encouraged to do so. libcurl will  then  attempt  to  re-use  the  same
       connection  for  the  following  transfers,  thus making the operations
       faster, less CPU intense and using less network  resources.  Just  note
       that  you  will  have to use curl_easy_setopt(3) between the invokes to
       set options for the following curl_easy_perform.

       You must never call this function simultaneously from two places  using
       the  same  handle.  Let  the  function  return first before invoking it
       another time. If you want parallel transfers, you must use several curl


       0  means  everything  was  ok,  non-zero  means  an  error  occurred as
       <curl/curl.h>  defines.  If  the  CURLOPT_ERRORBUFFER  was   set   with
       curl_easy_setopt  there  will  be a readable error message in the error
       buffer when non-zero is returned.


       curl_easy_init(3), curl_easy_setopt(3),