CURLOPT_ALTSVC(3)          curl_easy_setopt options          CURLOPT_ALTSVC(3)

NAME
       CURLOPT_ALTSVC - set alt-svc cache file name

SYNOPSIS
       #include <curl/curl.h>

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

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 _ALTSVC_CTRL&section=3">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 7.77.0                 November 4, 2020              CURLOPT_ALTSVC(3)