NAME

       CURLOPT_ALTSVC - set alt-svc cache file name

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ALTSVC, char *filename);

EXPERIMENTAL

       Warning:  this  feature is early code and is marked as experimental. It can only be enabled by explicitly
       telling configure with --enable-alt-svc. You are advised to  not  ship  this  in  production  before  the
       experimental label is removed.

DESCRIPTION

       Pass  in  a  pointer  to  a  filename  to  instruct libcurl to use that file as the Alt-Svc cache to read
       existing  cache  contents  from  and  possibly  also  write  it  back  to  a  after  a  transfer,  unless
       CURLALTSVC_READONLYFILE is set in CURLOPT_ALTSVC_CTRL(3).

       Specify a blank file name ("") to make libcurl not load from a file at all.

DEFAULT

       NULL. The alt-svc cache is not read nor written to file.

PROTOCOLS

       HTTPS

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_ALTSVC_CTRL, CURLALTSVC_H1);
         curl_easy_setopt(curl, CURLOPT_ALTSVC, "altsvc-cache.txt");
         curl_easy_perform(curl);
       }

AVAILABILITY

       Added in 7.64.1

RETURN VALUE

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

SEE ALSO

       CURLOPT_ALTSVC_CTRL(3), CURLOPT_CONNECT_TO(3), CURLOPT_RESOLVE(3), CURLOPT_COOKIEFILE(3),

libcurl 7.68.0                                   August 14, 2019                               CURLOPT_ALTSVC(3)