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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.