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deps/curl/docs/libcurl/opts/CURLOPT_TIMECONDITION.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_TIMECONDITION
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_FILETIME (3)
+  - CURLOPT_TIMEVALUE (3)
+---
+
+# NAME
+
+CURLOPT_TIMECONDITION - select condition for a time request
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMECONDITION, long cond);
+~~~
+
+# DESCRIPTION
+
+Pass a long as parameter. This defines how the CURLOPT_TIMEVALUE(3) time
+value is treated. You can set this parameter to *CURL_TIMECOND_IFMODSINCE*
+or *CURL_TIMECOND_IFUNMODSINCE*.
+
+The last modification time of a file is not always known and in such instances
+this feature has no effect even if the given time condition would not have
+been met. curl_easy_getinfo(3) with the *CURLINFO_CONDITION_UNMET*
+option can be used after a transfer to learn if a zero-byte successful
+"transfer" was due to this condition not matching.
+
+# DEFAULT
+
+CURL_TIMECOND_NONE (0)
+
+# PROTOCOLS
+
+HTTP, FTP, RTSP, and FILE
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    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 */
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Always
+
+# RETURN VALUE
+
+Returns CURLE_OK