NPN: remove support for and use of #9307
Closed
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
bagder
added
TLS
libcurl API
feature-window
jay
approved these changes
Aug 14, 2022
MarcelRaad
approved these changes
Aug 14, 2022
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
bagder
force-pushed
the
bagder/rm-NPN
branch
from
2a269ec
to
349089d
Compare
vszakats
added a commit
to curl/curl-for-win
that referenced
this pull request
Aug 10, 2023
- `no-nextprotoneg`: Obsolete. Support deleted from curl 7.86.0 (2022-09-05): curl/curl@472f1cb curl/curl#9307 Obsolete, not used by curl and libssh2: - `no-cmac` - `no-rc2` - `no-mdc2` - `no-whirlpool`
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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
--npnand in libcurl withCURLOPT_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.