Man page - curlopt_verbose(3)

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Manual

CURLOPT_VERBOSE

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO

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 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) .

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) .