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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_ALTSVC
Section: 3
Source: libcurl
See-also:
- CURLOPT_ALTSVC_CTRL (3)
- CURLOPT_CONNECT_TO (3)
- CURLOPT_COOKIEFILE (3)
- CURLOPT_RESOLVE (3)
---
<!-- markdown-link-check-disable -->
# NAME
CURLOPT_ALTSVC - alt-svc cache file name
# SYNOPSIS
~~~c
#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 after a transfer, unless **CURLALTSVC_READONLYFILE** is set in
CURLOPT_ALTSVC_CTRL(3).
Specify a blank filename ("") 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
~~~c
int main(void)
{
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.com 8443 h3 second.example.com 443 "20190808 06:18:37" 1 0
The fields of that line are:
## h2
ALPN id for the source origin
## www.example.comp
Hostname for the source origin
## 8443
Port number for the source origin
## h3
ALPN id for the destination host
## second.example.com
Hostname 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.
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