GNURLINFO...TION_UNMET(3)

okay so bestie, welcome to the GNURLINFO...TION_UNMET(3) page — it's filed under the curl_easy_getinfo options manual, and it's all about CURLINFO_CONDITION_UNMET. no cap, the manual name is literally that truncated-lookin' string. 💅

🎀 NAME 🎀

CURLINFO_CONDITION_UNMET — get info on unmet time conditional or 304 HTTP response. That's the whole vibe: it tells you when a conditional request didn't hand over the goods. 🦋

✨ SYNOPSIS ✨

#include <gnurl/curl.h>

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

💖 DESCRIPTION 💖

So here's the tea: you pass a pointer to a long to receive the number 1 if the condition provided in the previous request didn't match (see CURLOPT_TIMECONDITION(3)). Periodt. 💅

Alas, if this returns a 1, you know that the reason you didn't get data in return is because it didn't fulfill the condition. The long this argument points to will get 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. Highkey iconic. 🔥

🌈 PROTOCOLS 🌈

HTTP and some. Yep, “some” is literally what it says — I'm not making it up. 🙈

🧚 EXAMPLE 🧚

Here's the example, exact and ready to copy-paste, bestie:

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "http://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, 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":"");
    }
  }
}

That's the example as the page lays it out. 🍓

🦋 AVAILABILITY 🦋

Added in 7.19.4. She's been around. 👑

💜 RETURN VALUE 💜

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. Simple as that. ✨

🎀 SEE ALSO 🎀

The friends of this page:

• curl_easy_getinfo(3), curl_easy_setopt(3),

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From libcurl 7.44.0, dated 1 Sep 2015 — mwah, go forth and conditional-request, bestie. 💖✨