Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_easy_upkeep.3 @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH curl_easy_upkeep 3 "31 Oct 2018" "libcurl 7.62.0" "libcurl Manual"
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24 .SH NAME
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25 curl_easy_upkeep - Perform any connection upkeep checks.
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26 .SH SYNOPSIS
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27 .B #include <curl/curl.h>
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29 .BI "CURLcode curl_easy_upkeep(CURL *" handle ");"
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30 .SH DESCRIPTION
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31
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32 Some protocols have "connection upkeep" mechanisms. These mechanisms usually
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33 send some traffic on existing connections in order to keep them alive; this
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34 can prevent connections from being closed due to overzealous firewalls, for
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35 example.
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37 Currently the only protocol with a connection upkeep mechanism is HTTP/2: when
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38 the connection upkeep interval is exceeded and \fIcurl_easy_upkeep(3)\fP
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39 is called, an HTTP/2 PING frame is sent on the connection.
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41 This function must be explicitly called in order to perform the upkeep work.
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42 The connection upkeep interval is set with
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43 \fICURLOPT_UPKEEP_INTERVAL_MS(3)\fP.
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45 .SH AVAILABILITY
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46 Added in 7.62.0.
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47 .SH RETURN VALUE
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48 On success, returns \fBCURLE_OK\fP.
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50 On failure, returns the appropriate error code.
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52 .SH EXAMPLE
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53 .nf
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54 CURL *curl = curl_easy_init();
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55 if(curl) {
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56 /* Make a connection to an HTTP/2 server. */
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57 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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59 /* Set the interval to 30000ms / 30s */
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60 curl_easy_setopt(curl, CURLOPT_UPKEEP_INTERVAL_MS, 30000L);
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62 curl_easy_perform(curl);
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64 /* Perform more work here. */
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66 /* While the connection is being held open, curl_easy_upkeep() can be
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67 called. If curl_easy_upkeep() is called and the time since the last
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68 upkeep exceeds the interval, then an HTTP/2 PING is sent. */
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69 curl_easy_upkeep(curl);
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71 /* Perform more work here. */
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73 /* always cleanup */
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74 curl_easy_cleanup(curl);
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75 }
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77 .fi