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CURLOPT_ALTSVC(3)          curl_easy_setopt options          CURLOPT_ALTSVC(3)


NAME

       CURLOPT_ALTSVC - 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);
       }


FILE FORMAT

       A text based file with one line per alt-svc entry and each line
       consists of nine space-separated fields.

       An example line could look like

        h2 www.example 8443 h3 second.example 443 "20190808 06:18:37" 1 0

       The fields of that line are:

       h2     ALPN id for the source origin

       www.example
              Host name for the source origin

       8443   Port number for the source origin

       h3     ALPN id for the destination host

       second.example
              Host name for the destination host

       443    Port number for the destination host

       2019*  Expiration date and time of this entry within double quotes. The
              date format is "YYYYMMDD HH:MM:SS" and the time zone is GMT.

       1      Boolean (1 or 0) if "persist" was set for this entry

       0      Integer priority value (not currently used)


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 7.87.0                September 20, 2022             CURLOPT_ALTSVC(3)

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