CURLOPT_VERBOSE(3) Library Functions Manual 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 is sent to stderr, or the stream set with CURLOPT_STDERR(3).

You hardly ever want this enabled in production use, you almost always want this used 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

int main(void)
{
  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_DEBUGFUNCTION(3), CURLOPT_ERRORBUFFER(3), CURLOPT_STDERR(3), curl_global_trace(3)

2024-05-22 libcurl