--- c: Copyright (C) Daniel Stenberg, , et al. SPDX-License-Identifier: curl Title: CURLINFO_CONDITION_UNMET Section: 3 Source: libcurl See-also: - CURLOPT_TIMECONDITION (3) - CURLOPT_TIMEVALUE (3) - curl_easy_getinfo (3) - curl_easy_setopt (3) Protocol: - HTTP Added-in: 7.19.4 --- # NAME CURLINFO_CONDITION_UNMET - get info on unmet time conditional or 304 HTTP response. # SYNOPSIS ~~~c #include 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% # EXAMPLE ~~~c 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% # RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.