**************************************************************************
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* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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CURLINFO_SPEED_DOWNLOAD_T - get download speed #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SPEED_DOWNLOAD_T, curl_off_t *speed); Pass a pointer to a curl_off_t to receive the average download speed that curl measured for the complete download. Measured in bytes/second.

CURL *curl = curl_easy_init();
if(curl) {
 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

 /* Perform the request */
 res = curl_easy_perform(curl);

 if(!res) {
 curl_off_t speed;
 res = curl_easy_getinfo(curl, CURLINFO_SPEED_DOWNLOAD_T, &speed);
 if(!res) {
 printf("Download speed %" CURL_FORMAT_CURL_OFF_T " bytes/sec\\n", speed);
 }
 }
}

Added in 7.55.0 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. curl_easy_getinfo "(3), " curl_easy_setopt "(3), " CURLINFO_SPEED_UPLOAD "(3), " CURLINFO_SIZE_UPLOAD_T "(3), "