CURLOPT_TIMECONDITION explained
Name
CURLOPT_TIMECONDITION - select condition for a time request
Synopsis
#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 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 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
This functionality affects http only
Example
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
Added in curl 7.1
Return value
Returns CURLE_OK
See also
CURLINFO_FILETIME(3), CURLOPT_TIMEVALUE(3)
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