CURLOPT_VERBOSE(3) Library Functions Manual CURLOPT_VERBOSE(3)
NAME
CURLOPT_VERBOSE - verbose mode
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_VERBOSE, long onoff);
DESCRIPTION
Set the onoff parameter to 1 to make the library display a lot of ver-
bose 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).
WARNING this may show sensitive contents from headers and data.
DEFAULT
0, meaning disabled.
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
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);
}
}
AVAILABILITY
Added in curl 7.1
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_DEBUGFUNCTION(3), CURLOPT_ERRORBUFFER(3), CURLOPT_STDERR(3),
curl_global_trace(3)
libcurl 2026-07-12 CURLOPT_VERBOSE(3)
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