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 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),