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In libcurl, CURLINFO_CONDITION_UNMET is used to avoid writing to the output file if the server did not transfered a file based on time condition. In the same manner, getting a 304 HTTP response back from the server, for example after passing a custom If-Match-* header, also fulfill this condition. Fixes #5181 Closes #5183
71 lines
2.7 KiB
Groff
71 lines
2.7 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLINFO_CONDITION_UNMET 3 "1 Sep 2015" "libcurl 7.44.0" "curl_easy_getinfo options"
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.SH NAME
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CURLINFO_CONDITION_UNMET \- get info on unmet time conditional or 304 HTTP response.
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONDITION_UNMET, long *unmet);
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.SH DESCRIPTION
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Pass a pointer to a long to receive the number 1 if the condition provided in
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the previous request didn't match (see \fICURLOPT_TIMECONDITION(3)\fP). Alas,
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if this returns a 1 you know that the reason you didn't get data in return is
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because it didn't fulfill the condition. The long this argument points to will
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get a zero stored if the condition instead was met. This can also return 1 if
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the server responded with a 304 HTTP status code, for example after sending a
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custom "If-Match-*" header.
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.SH PROTOCOLS
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HTTP and some
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
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/* January 1, 2020 is 1577833200 */
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curl_easy_setopt(curl, CURLOPT_TIMEVALUE, 1577833200L);
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/* If-Modified-Since the above time stamp */
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curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
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/* Perform the request */
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res = curl_easy_perform(curl);
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if(!res) {
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/* check the time condition */
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long unmet;
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res = curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &unmet);
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if(!res) {
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printf("The time condition was %sfulfilled\\n", unmet?"NOT":"");
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}
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.19.4
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "
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