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
       information 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  single  name  resolve  string  should be written using the format
       HOST:PORT: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 the numerical  IP  address.  If  libcurl  is
       built  to  support  IPv6,  ADDRESS can of course be either 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.  Addresses  set
       with CURLOPT_RESOLVE(3) will not time-out from the DNS cache like ordi-
       nary entries.

       The provided ADDRESS set by this option  will  be  used  even  if  CUR-
       LOPT_IPRESOLVE(3) is set to make libcurl use another IP version.

       Remove  names  from  the  DNS cache again, to stop providing these fake
       resolves, by including a string in the linked list that uses the format
       "-HOST:PORT".  The host name must be prefixed with a dash, and the host
       name and port number must exactly match what was already  added  previ-
       ously.

DEFAULT
       NULL

PROTOCOLS
       All

EXAMPLE
       CURL *curl;
       struct curl_slist *host = NULL;
       host = curl_slist_append(NULL, "example.com:80:127.0.0.1");

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

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 7.54.0                   May 17, 2016               CURLOPT_RESOLVE(3)