1---
2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
3SPDX-License-Identifier: curl
4Title: CURLINFO_CONDITION_UNMET
5Section: 3
6Source: libcurl
7See-also:
8  - CURLOPT_TIMECONDITION (3)
9  - CURLOPT_TIMEVALUE (3)
10  - curl_easy_getinfo (3)
11  - curl_easy_setopt (3)
12Protocol:
13  - HTTP
14---
15
16# NAME
17
18CURLINFO_CONDITION_UNMET - get info on unmet time conditional or 304 HTTP response.
19
20# SYNOPSIS
21
22~~~c
23#include <curl/curl.h>
24
25CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONDITION_UNMET,
26                           long *unmet);
27~~~
28
29# DESCRIPTION
30
31Pass a pointer to a long to receive the number 1 if the condition provided in
32the previous request did not match (see CURLOPT_TIMECONDITION(3)). Alas,
33if this returns a 1 you know that the reason you did not get data in return is
34because it did not fulfill the condition. The long this argument points to
35gets a zero stored if the condition instead was met. This can also return 1 if
36the server responded with a 304 HTTP status code, for example after sending a
37custom "If-Match-*" header.
38
39# EXAMPLE
40
41~~~c
42int main(void)
43{
44  CURL *curl = curl_easy_init();
45  if(curl) {
46    CURLcode res;
47
48    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
49
50    /* January 1, 2020 is 1577833200 */
51    curl_easy_setopt(curl, CURLOPT_TIMEVALUE, 1577833200L);
52
53    /* If-Modified-Since the above time stamp */
54    curl_easy_setopt(curl, CURLOPT_TIMECONDITION,
55                     (long)CURL_TIMECOND_IFMODSINCE);
56
57    /* Perform the request */
58    res = curl_easy_perform(curl);
59
60    if(!res) {
61      /* check the time condition */
62      long unmet;
63      res = curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &unmet);
64      if(!res) {
65        printf("The time condition was %sfulfilled\n", unmet?"NOT":"");
66      }
67    }
68  }
69}
70~~~
71
72# AVAILABILITY
73
74Added in 7.19.4
75
76# RETURN VALUE
77
78Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
79