DOKK / manpages / debian 11 / libcurl4-doc / CURLOPT_VERBOSE.3.en
CURLOPT_VERBOSE(3) curl_easy_setopt options CURLOPT_VERBOSE(3)

CURLOPT_VERBOSE - set verbose mode on/off

#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. Very 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),

November 4, 2020 libcurl 7.74.0