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CURLOPT_RESOLVE(3)

CURLOPT_RESOLVE(3)         curl_easy_setopt options         CURLOPT_RESOLVE(3)

NAME
       CURLOPT_RESOLVE - provide custom host name to IP address resolves

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESOLVE,
                                 struct curl_slist *hosts);

DESCRIPTION
       Pass  a  pointer to a linked list of strings with host name resolve in‐
       formation to use for requests with this handle. The linked list  should
       be  a fully valid list of struct curl_slist structs properly filled in.
       Use curl_slist_append(3) to create the list and  curl_slist_free_all(3)
       to clean up an entire list.

       Each resolve rule to add should be written using the format

        [+]HOST:PORT:ADDRESS[,ADDRESS]

       ...  where  HOST  is  the name libcurl will try to resolve, PORT is the
       port number of the service where libcurl wants to connect to  the  HOST
       and  ADDRESS is one or more numerical IP addresses. If you specify mul‐
       tiple IP addresses they need to be separated by comma.  If  libcurl  is
       built to support IPv6, each of the ADDRESS entries can of course be ei‐
       ther IPv4 or IPv6 style addressing.

       This  option  effectively  pre-populates the DNS cache with entries for
       the host+port pair so redirects and everything that operations  against
       the HOST+PORT will instead use your provided ADDRESS.

       The  optional leading "+" specifies that the new entry should time-out.
       Entries added without the leading plus character  will  never  time-out
       whereas entries added with "+HOST:..." will time-out just like ordinary
       DNS cache entries.

       If the DNS cache already has an entry for the given host+port pair, the
       new entry will override the former one.

       An  ADDRESS provided by this option will only be used if not restricted
       by the setting of CURLOPT_IPRESOLVE(3) to a different IP version.

       To remove names from the DNS cache again, to stop providing these  fake
       resolves, include a string in the linked list that uses the format

         -HOST:PORT

       The entry to remove must be prefixed with a dash, and the host name and
       port number must exactly match what was added previously.

DEFAULT
       NULL

PROTOCOLS
       All

EXAMPLE
       CURL *curl;
       struct curl_slist *host = NULL;
       host = curl_slist_append(NULL, "example.com:443:127.0.0.1");

       curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_RESOLVE, host);
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

         curl_easy_perform(curl);

         /* always cleanup */
         curl_easy_cleanup(curl);
       }

       curl_slist_free_all(host);

AVAILABILITY
       Added in 7.21.3. Removal support added in 7.42.0.

       Support  for  providing  the  ADDRESS  within  [brackets]  was added in
       7.57.0.

       Support for providing multiple IP addresses  per  entry  was  added  in
       7.59.0.

       Support  for  adding  non-permanent entries by using the "+" prefix was
       added in 7.75.0.

RETURN VALUE
       Returns CURLE_OK if the option is supported,  and  CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLOPT_IPRESOLVE(3),     CURLOPT_DNS_CACHE_TIMEOUT(3),    CURLOPT_CON‐
       NECT_TO(3),

libcurl 7.86.0                September 20, 2022            CURLOPT_RESOLVE(3)
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