CURLINFO_CONDITION_UNMET - Man Page
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
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
See Also
CURLOPT_TIMECONDITION(3), CURLOPT_TIMEVALUE(3), curl_easy_getinfo(3), curl_easy_setopt(3)