NAME

       curl_slist_append - add a string to an slist

SYNOPSIS

       #include <curl/curl.h>

       struct curl_slist *curl_slist_append(struct curl_slist *list,
                                            const char *string);

DESCRIPTION

       curl_slist_append(3)  appends a string to a linked list of strings. The existing list should be passed as
       the first argument and the new list is returned from this function. Pass in NULL in the list argument  to
       create   a   new   list.   The   specified   string   has  been  appended  when  this  function  returns.
       curl_slist_append(3) copies the string. The string argument must be a valid string pointer and cannot  be
       NULL.

       The list should be freed again (after usage) with curl_slist_free_all(3).

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         CURL *handle = curl_easy_init();
         struct curl_slist *slist = NULL;
         struct curl_slist *temp = NULL;

         slist = curl_slist_append(slist, "pragma:");

         if(!slist)
           return -1;

         temp = curl_slist_append(slist, "Accept:");

         if(!temp) {
           curl_slist_free_all(slist);
           return -1;
         }

         slist = temp;

         curl_easy_setopt(handle, CURLOPT_HTTPHEADER, slist);

         curl_easy_perform(handle);

         curl_slist_free_all(slist); /* free the list again */
       }

AVAILABILITY

       Added in curl 7.1

RETURN VALUE

       A  null  pointer is returned if anything went wrong, otherwise the new list pointer is returned. To avoid
       overwriting an existing non-empty list on failure, the  new  list  should  be  returned  to  a  temporary
       variable which can be tested for NULL before updating the original list pointer.

SEE ALSO

       curl_slist_free_all(3)

libcurl                                            2025-11-07                               curl_slist_append(3)