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12a2ed970f
In every libcurl option man page there are now 8 mandatory sections that must use the right name in the correct order and test 1173 verifies this. Only 14 man pages needed adjustments. The sections and the order is as follows: - NAME - SYNOPSIS - DESCRIPTION - PROTOCOLS - EXAMPLE - AVAILABILITY - RETURN VALUE - SEE ALSO Reviewed-by: Daniel Gustafsson Closes #7656
79 lines
2.8 KiB
Groff
79 lines
2.8 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 - 2021, 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.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 CURLOPT_UPKEEP_INTERVAL_MS 3 "31 Oct 2018" "libcurl 7.62.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_UPKEEP_INTERVAL_MS \- connection upkeep interval
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPKEEP_INTERVAL_MS, long upkeep_interval_ms);
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.SH DESCRIPTION
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Some protocols have "connection upkeep" mechanisms. These mechanisms usually
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send some traffic on existing connections in order to keep them alive; this
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can prevent connections from being closed due to overzealous firewalls, for
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example.
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The user needs to explicitly call \fIcurl_easy_upkeep(3)\fP in order to
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perform the upkeep work.
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Currently the only protocol with a connection upkeep mechanism is HTTP/2: when
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the connection upkeep interval is exceeded and \fIcurl_easy_upkeep(3)\fP
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is called, an HTTP/2 PING frame is sent on the connection.
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.SH DEFAULT
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CURL_UPKEEP_INTERVAL_DEFAULT (currently defined as 60000L, which is 60 seconds)
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.SH PROTOCOLS
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All
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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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/* Make a connection to an HTTP/2 server. */
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* Set the interval to 30000ms / 30s */
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curl_easy_setopt(curl, CURLOPT_UPKEEP_INTERVAL_MS, 30000L);
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curl_easy_perform(curl);
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/* Perform more work here. */
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/* While the connection is being held open, curl_easy_upkeep() can be
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called. If curl_easy_upkeep() is called and the time since the last
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upkeep exceeds the interval, then an HTTP/2 PING is sent. */
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curl_easy_upkeep(curl);
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/* Perform more work here. */
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/* always cleanup */
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curl_easy_cleanup(curl);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.62.0
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.SH RETURN VALUE
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Returns CURLE_OK
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.SH SEE ALSO
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.BR CURLOPT_TCP_KEEPALIVE "(3), "
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