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),