mirror of
https://github.com/curl/curl.git
synced 2025-01-18 14:04:30 +08:00
e3fe020089
Remove the PROTOCOLS section from the source files completely and instead generate them based on the header data in the curldown files. It also generates TLS backend information for options marked for TLS as protocol. Closes #13175
110 lines
2.0 KiB
Markdown
110 lines
2.0 KiB
Markdown
---
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.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)
|
|
Protocol:
|
|
- HTTP
|
|
---
|
|
<!-- markdown-link-check-disable -->
|
|
# NAME
|
|
|
|
CURLOPT_ALTSVC - alt-svc cache filename
|
|
|
|
# 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.
|
|
|
|
# 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.
|