Tribblix: manual page: CURLOPT

CURLOPT_TIMECONDITION(3) Introduction to Library Functions

NAME

CURLOPT_TIMECONDITION - select condition for a time request

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMECONDITION, long cond);

DESCRIPTION

Pass a long as parameter. This defines how the CURLOPT_TIMEVALUE(3)
time value is treated. You can set this parameter to
CURL_TIMECOND_IFMODSINCE or CURL_TIMECOND_IFUNMODSINCE.

The last modification time of a file is not always known and in such
instances this feature has no effect even if the given time condition
would not have been met. curl_easy_getinfo(3) with the
CURLINFO_CONDITION_UNMET option can be used after a transfer to learn
if a zero-byte successful "transfer" was due to this condition not
matching.

DEFAULT

CURL_TIMECOND_NONE (0)

PROTOCOLS

This functionality affects http only

EXAMPLE

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

/* January 1, 2020 is 1577833200 */
curl_easy_setopt(curl, CURLOPT_TIMEVALUE, 1577833200L);

/* If-Modified-Since the above time stamp */
curl_easy_setopt(curl, CURLOPT_TIMECONDITION,
(long)CURL_TIMECOND_IFMODSINCE);

/* 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).