Tribblix: manual page: CURLINFO_CONDITION

CURLINFO_CONDITION_UNMET(3) Introduction to Library Functions

NAME

CURLINFO_CONDITION_UNMET - get info on unmet time conditional or 304
HTTP response.

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONDITION_UNMET,
long *unmet);

DESCRIPTION

Pass a pointer to a long to receive the number 1 if the condition
provided in the previous request did not match (see
CURLOPT_TIMECONDITION(3)). Alas, if this returns a 1 you know that
the reason you did not get data in return is because it did not
fulfill the condition. The long this argument points to gets a zero
stored if the condition instead was met. This can also return 1 if
the server responded with a 304 HTTP status code, for example after
sending a custom "If-Match-*" header.

PROTOCOLS

This functionality affects http only

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;

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 */
res = curl_easy_perform(curl);

if(!res) {
/* check the time condition */
long unmet;
res = curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &unmet);
if(!res) {
printf("The time condition was %sfulfilled\n", unmet?"NOT":"");
}
}
}
}

AVAILABILITY

Added in curl 7.19.4

RETURN VALUE

curl_easy_getinfo(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).