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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_RESOLVE.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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23 .TH CURLOPT_RESOLVE 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_RESOLVE \- provide custom host name to IP address resolves
26 .SH SYNOPSIS
27 .nf
28 #include <curl/curl.h>
29
30 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESOLVE,
31 struct curl_slist *hosts);
32 .SH DESCRIPTION
33 Pass a pointer to a linked list of strings with host name resolve information
34 to use for requests with this handle. The linked list should be a fully valid
35 list of \fBstruct curl_slist\fP structs properly filled in. Use
36 \fIcurl_slist_append(3)\fP to create the list and \fIcurl_slist_free_all(3)\fP
37 to clean up an entire list.
38
39 Each single name resolve string should be written using the format
40 HOST:PORT:ADDRESS[,ADDRESS]... where HOST is the name libcurl will try
41 to resolve, PORT is the port number of the service where libcurl wants
42 to connect to the HOST and ADDRESS is one or more numerical IP
43 addresses. If you specify multiple ip addresses they need to be
44 separated by comma. If libcurl is built to support IPv6, each of the
45 ADDRESS entries can of course be either IPv4 or IPv6 style addressing.
46
47 This option effectively pre-populates the DNS cache with entries for the
48 host+port pair so redirects and everything that operations against the
49 HOST+PORT will instead use your provided ADDRESS. Addresses set with
50 \fICURLOPT_RESOLVE(3)\fP will not time-out from the DNS cache like ordinary
51 entries.
52
53 If the DNS cache already have an entry for the given host+port pair, then
54 this entry will be removed and a new entry will be created. This is because
55 old entry may have have different addresses or be ordinary entries with
56 time-outs.
57
58 The provided ADDRESS set by this option will be used even if
59 \fICURLOPT_IPRESOLVE(3)\fP is set to make libcurl use another IP version.
60
61 Remove names from the DNS cache again, to stop providing these fake resolves,
62 by including a string in the linked list that uses the format
63 \&"-HOST:PORT". The host name must be prefixed with a dash, and the host name
64 and port number must exactly match what was already added previously.
65
66 Support for providing the ADDRESS within [brackets] was added in 7.57.0.
67
68 Support for providing multiple IP addresses per entry was added in 7.59.0.
69 .SH DEFAULT
70 NULL
71 .SH PROTOCOLS
72 All
73 .SH EXAMPLE
74 .nf
75 CURL *curl;
76 struct curl_slist *host = NULL;
77 host = curl_slist_append(NULL, "example.com:80:127.0.0.1");
78
79 curl = curl_easy_init();
80 if(curl) {
81 curl_easy_setopt(curl, CURLOPT_RESOLVE, host);
82 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
83
84 curl_easy_perform(curl);
85
86 /* always cleanup */
87 curl_easy_cleanup(curl);
88 }
89
90 curl_slist_free_all(host);
91 .fi
92 .SH AVAILABILITY
93 Added in 7.21.3. Removal support added in 7.42.0.
94 .SH RETURN VALUE
95 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
96 .SH "SEE ALSO"
97 .BR CURLOPT_IPRESOLVE "(3), " CURLOPT_DNS_CACHE_TIMEOUT "(3), " CURLOPT_CONNECT_TO "(3), "