Provided by: libcurl4-doc_7.88.1-8ubuntu1_all bug


       CURLOPT_RESOLVE - provide custom host name to IP address resolves


       #include <curl/curl.h>

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


       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 resolve rule to add should be written using the format


       ... 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 multiple 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 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.

       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


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






       CURL *curl;
       struct curl_slist *host = NULL;
       host = curl_slist_append(NULL, "");

       curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_RESOLVE, host);
         curl_easy_setopt(curl, CURLOPT_URL, "");


         /* always cleanup */



       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.


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