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94 lines
3.5 KiB
Groff
94 lines
3.5 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_CONNECT_TO.md
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.TH CURLOPT_CONNECT_TO 3 libcurl
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.SH NAME
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CURLOPT_CONNECT_TO \- connect to another host and port instead
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONNECT_TO,
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struct curl_slist *connect_to);
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.fi
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.SH DESCRIPTION
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Pass a pointer to a linked list of strings with "connect to" information to
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use for establishing network connections with this handle. The linked list
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should be a fully valid list of \fBstruct curl_slist\fP structs properly filled
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in. Use \fIcurl_slist_append(3)\fP to create the list and \fIcurl_slist_free_all(3)\fP to
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clean up an entire list.
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Each single string should be written using the format
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HOST:PORT:CONNECT\-TO\-HOST:CONNECT\-TO\-PORT where HOST is the host of the
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request, PORT is the port of the request, CONNECT\-TO\-HOST is the hostname to
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connect to, and CONNECT\-TO\-PORT is the port to connect to.
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The first string that matches the request\(aqs host and port is used.
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Dotted numerical IP addresses are supported for HOST and CONNECT\-TO\-HOST.
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A numerical IPv6 address must be written within [brackets].
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Any of the four values may be empty. When the HOST or PORT is empty, the host
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or port always match (the request\(aqs host or port is ignored). When
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CONNECT\-TO\-HOST or CONNECT\-TO\-PORT is empty, the "connect to" feature is
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disabled for the host or port, and the request\(aqs host or port are used to
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establish the network connection.
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This option is suitable to direct the request at a specific server, e.g. at a
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specific cluster node in a cluster of servers.
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The "connect to" host and port are only used to establish the network
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connection. They do NOT affect the host and port that are used for TLS/SSL
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(e.g. SNI, certificate verification) or for the application protocols.
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In contrast to \fICURLOPT_RESOLVE(3)\fP, the option \fICURLOPT_CONNECT_TO(3)\fP does not
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pre\-populate the DNS cache and therefore it does not affect future transfers
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of other easy handles that have been added to the same multi handle.
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The "connect to" host and port are ignored if they are equal to the host and
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the port in the request URL, because connecting to the host and the port in
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the request URL is the default behavior.
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If an HTTP proxy is used for a request having a special "connect to" host or
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port, and the "connect to" host or port differs from the request\(aqs host and
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port, the HTTP proxy is automatically switched to tunnel mode for this
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specific request. This is necessary because it is not possible to connect to a
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specific host or port in normal (non\-tunnel) mode.
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When this option is passed to \fIcurl_easy_setopt(3)\fP, libcurl does not copy the
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list so you \fBmust\fP keep it around until you no longer use this \fIhandle\fP for
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a transfer before you call \fIcurl_slist_free_all(3)\fP on the list.
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.SH DEFAULT
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NULL
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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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int main(void)
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{
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CURL *curl;
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struct curl_slist *connect_to = NULL;
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connect_to = curl_slist_append(NULL, "example.com::server1.example.com:");
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curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_CONNECT_TO, connect_to);
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_perform(curl);
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/* always cleanup */
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curl_easy_cleanup(curl);
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}
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curl_slist_free_all(connect_to);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.49.0
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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 CURLOPT_FOLLOWLOCATION (3),
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.BR CURLOPT_HTTPPROXYTUNNEL (3),
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.BR CURLOPT_RESOLVE (3),
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.BR CURLOPT_URL (3)
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