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HTTP2.md: mention the disable ALPN and NPN options

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Daniel Stenberg
2016-03-08 00:02:52 +01:00
parent 52a0b934ef
commit 7e8b65c00b
1 changed files with 3 additions and 1 deletions
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docs/HTTP2.md
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@@ -36,12 +36,14 @@ Over an https:// URL
If `CURLOPT_HTTP_VERSION` is set to `CURL_HTTP_VERSION_2_0`, libcurl will use
ALPN (or NPN) to negotiate which protocol to continue with. Possibly introduce
an option that will cause libcurl to fail if not possible to use HTTP/2.
Consider options to explicitly disable ALPN and/or NPN.
ALPN is the TLS extension that HTTP/2 is expected to use. The NPN extension is
for a similar purpose, was made prior to ALPN and is used for SPDY so early
HTTP/2 servers are implemented using NPN before ALPN support is widespread.
`CURLOPT_SSL_ENABLE_ALPN` and `CURLOPT_SSL_ENABLE_NPN` are offered to allow
applications to explicitly disable ALPN or NPN.
SSL libs
--------