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curl/docs/cmdline-opts/no-npn.d

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docs/cmdline-opts: add copyright and license identifier to each file gen.pl now insists on C: and SPDX-License-Identifier: fields to be present in all files. Closes #9002
2022-06-14 06:12:03 +08:00
c: Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
cmdline-opts: first test version of a new man page generator kit See MANPAGE.md for the description of how this works. Each command line option is now described in a separate .d file.
2016-11-14 06:40:12 +08:00
Long: no-npn
cmdline-docs: more conversion
2016-11-16 21:20:36 +08:00
Tags: Versions HTTP/2
cmdline-opts: first test version of a new man page generator kit See MANPAGE.md for the description of how this works. Each command line option is now described in a separate .d file.
2016-11-14 06:40:12 +08:00
Protocols: HTTPS
Added: 7.36.0
Mutexed:
See-also: no-alpn http2
Requires: TLS
cmdline-opts: support generating the --help output
2016-11-15 16:08:50 +08:00
Help: Disable the NPN TLS extension
docs: add categories to all cmdline opts Adapted gen.pl with 'listcats' This commit is a part of "--help me if you can" Closes #5680
2020-07-13 20:15:04 +08:00
Category: tls http
curl.1: provide examples for each option The file format for each option now features a "Example:" header that can provide one or more examples that get rendered appropriately in the output. All options MUST have at least one example or gen.pl complains at build-time. This fix also does a few other minor format and consistency cleanups. Closes #7654
2021-08-31 22:37:14 +08:00
Example: --no-npn $URL
cmdline-opts: first test version of a new man page generator kit See MANPAGE.md for the description of how this works. Each command line option is now described in a separate .d file.
2016-11-14 06:40:12 +08:00
---
NPN: remove support for and use of Next Protocol Negotiation is a TLS extension that was created and used for agreeing to use the SPDY protocol (the precursor to HTTP/2) for HTTPS. In the early days of HTTP/2, before the spec was finalized and shipped, the protocol could be enabled using this extension with some servers. curl supports the NPN extension with some TLS backends since then, with a command line option `--npn` and in libcurl with `CURLOPT_SSL_ENABLE_NPN`. HTTP/2 proper is made to use the ALPN (Application-Layer Protocol Negotiation) extension and the NPN extension has no purposes anymore. The HTTP/2 spec was published in May 2015. Today, use of NPN in the wild should be extremely rare and most likely totally extinct. Chrome removed NPN support in Chrome 51, shipped in June 2016. Removed in Firefox 53, April 2017. Closes #9307
2022-09-01 15:23:22 +08:00
In curl 7.86.0 and later, curl never uses NPN.
cmdline-opts: first test version of a new man page generator kit See MANPAGE.md for the description of how this works. Each command line option is now described in a separate .d file.
2016-11-14 06:40:12 +08:00
Disable the NPN TLS extension. NPN is enabled by default if libcurl was built
with an SSL library that supports NPN. NPN is used by a libcurl that supports
HTTP/2 to negotiate HTTP/2 support with the server during https sessions.
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