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-rw-r--r--docs/libcurl/opts/CURLOPT_HTTP_VERSION.37
1 files changed, 6 insertions, 1 deletions
diff --git a/docs/libcurl/opts/CURLOPT_HTTP_VERSION.3 b/docs/libcurl/opts/CURLOPT_HTTP_VERSION.3
index dd57a2989..f56d61a5c 100644
--- a/docs/libcurl/opts/CURLOPT_HTTP_VERSION.3
+++ b/docs/libcurl/opts/CURLOPT_HTTP_VERSION.3
@@ -5,7 +5,7 @@
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
-.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
@@ -54,6 +54,11 @@ actual protocol name.
Attempt HTTP 2 over TLS (HTTPS) only. libcurl will fall back to HTTP 1.1 if
HTTP 2 can't be negotiated with the HTTPS server. For clear text HTTP servers,
libcurl will use 1.1. (Added in 7.47.0)
+.IP CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
+Issue non-TLS HTTP requests using HTTP/2 without HTTP/1.1 Upgrade. It requires
+prior knowledge that the server supports HTTP/2 straight away. HTTPS requests
+will still do HTTP/2 the standard way with negotiated protocol version in the
+TLS handshake.
.SH DEFAULT
CURL_HTTP_VERSION_NONE
.SH PROTOCOLS