Manpages - CURLOPT_VERBOSE.3

CURLOPT_VERBOSE - verbose mode

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_VERBOSE, long onoff);

Set the onoff parameter to 1 to make the library display a lot of verbose information about its operations on this handle. Useful for libcurl and/or protocol debugging and understanding. The verbose information will be sent to stderr, or the stream set with CURLOPT_STDERR(3).

You hardly ever want this set in production use, you will almost always want this when you debug/report problems.

To also get all the protocol data sent and received, consider using the CURLOPT_DEBUGFUNCTION(3).

0, meaning disabled.

All

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

    /* ask libcurl to show us the verbose output */
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

    /* Perform the request */
    curl_easy_perform(curl);
  }

Always

Returns CURLE_OK

*CURLOPT_STDERR*(3), *CURLOPT_DEBUGFUNCTION*(3), *CURLOPT_ERRORBUFFER*(3),