docs: remove ALTSVC.md, HSTS.md, HTTP2.md and PARALLEL-TRANSFERS.md

These are files and documentation for established functionality that
should by now be covered properly and completely in the standard
documentation and in everything curl. Having these extra files provides
duplicated information where they risk being out of sync.

Closes #14553
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Daniel Stenberg 2024-08-15 10:04:03 +02:00
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<!--
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
-->
# Alt-Svc
curl features support for the Alt-Svc: HTTP header.
## Enable Alt-Svc in build
`./configure --enable-alt-svc`
(enabled by default since 7.73.0)
## Standard
[RFC 7838](https://datatracker.ietf.org/doc/html/rfc7838)
# Alt-Svc cache file format
This is a text based file with one line per entry and each line consists of nine
space separated fields.
## Example
h2 quic.tech 8443 h3-22 quic.tech 8443 "20190808 06:18:37" 0 0
## Fields
1. The ALPN id for the source origin
2. The hostname for the source origin
3. The port number for the source origin
4. The ALPN id for the destination host
5. The hostname for the destination host
6. The port number for the destination host
7. The expiration date and time of this entry within double quotes. The date format is "YYYYMMDD HH:MM:SS" and the time zone is GMT.
8. Boolean (1 or 0) if "persist" was set for this entry
9. Integer priority value (not currently used)
If the hostname is an IPv6 numerical address, it is stored with brackets such
as `[::1]`.
# TODO
- handle multiple response headers, when one of them says `clear` (should
override them all)
- using `Age:` value for caching age as per spec
- `CURLALTSVC_IMMEDIATELY` support