CURLINFO_CONDITION_UNMET(3) - Man pages

CURLINFO_CONDITION_UNMET(3) Library Functions ManualCURLINFO_CONDITION_UNMET(3)

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  pro-
       vided  in  the  previous  request  did not match (see CURLOPT_TIMECONDI-
       TION(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 sta-
       tus 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).

SEE ALSO
       CURLOPT_TIMECONDITION(3),  CURLOPT_TIMEVALUE(3),   curl_easy_getinfo(3),
       curl_easy_setopt(3)

libcurl                            2026-07-12       CURLINFO_CONDITION_UNMET(3)

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