CURLOPT_LOW_SPEED_LIMIT - set low speed limit in bytes per second
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOW_SPEED_LIMIT, long speedlimit);
Pass a long as parameter. It contains the average transfer speed in bytes per second that the transfer should be below during CURLOPT_LOW_SPEED_TIME seconds for libcurl to consider it to be too slow and abort.
CURLOPT_LOW_SPEED_TIME CURLOPT_TIMEOUT
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