http: add CURLINFO_HTTP_VERSION and %{http_version}

Adds access to the effectively used http version to both libcurl and
curl.

Closes #799

7 files changed, 104 insertions, 2 deletions

diff --git a/docs/curl.1 b/docs/curl.1
index f2d48f171..ed047724e 100644
--- a/docs/curl.1
+++ b/docs/curl.1
@@ -1944,6 +1944,9 @@ same info.
 The numerical code that was found in the last response (from a proxy) to a
 curl CONNECT request. (Added in 7.12.4)
 .TP
+.B http_version
+The http version that was effectively used. (Added in 7.50.0)
+.TP
 .B local_ip
 The IP address of the local end of the most recently done connection - can be
 either IPv4 or IPv6 (Added in 7.29.0)
diff --git a/docs/libcurl/curl_easy_getinfo.3 b/docs/libcurl/curl_easy_getinfo.3
index 2b4c7fe53..9ffcd14af 100644
--- a/docs/libcurl/curl_easy_getinfo.3
+++ b/docs/libcurl/curl_easy_getinfo.3
@@ -50,6 +50,9 @@ See \fICURLINFO_RESPONSE_CODE(3)\fP
 .IP CURLINFO_HTTP_CONNECTCODE
 Last proxy CONNECT response code.
 See \fICURLINFO_HTTP_CONNECTCODE(3)\fP
+.IP CURLINFO_HTTP_VERSION
+The http version used in the connection.
+See \fICURLINFO_HTTP_VERSION(3)\fP
 .IP CURLINFO_FILETIME
 Remote time of the retrieved document.
 See \fICURLINFO_FILETIME(3)\fP
diff --git a/docs/libcurl/opts/CURLINFO_HTTP_VERSION.3 b/docs/libcurl/opts/CURLINFO_HTTP_VERSION.3
new file mode 100644
index 000000000..b0f43e549
--- /dev/null
+++ b/docs/libcurl/opts/CURLINFO_HTTP_VERSION.3
@@ -0,0 +1,56 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * 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
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLINFO_HTTP_VERSION 3 "11 May 2016" "libcurl 7.50.0" "curl_easy_getinfo options"
+.SH NAME
+CURLINFO_HTTP_VERSION \- get the http version used in the connection
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_HTTP_VERSION, long *p);
+.SH DESCRIPTION
+Pass a pointer to a long to receive the version used in the last http connection.
+The returned value will be CURL_HTTP_VERSION_1_0, CURL_HTTP_VERSION_1_1, or
+CURL_HTTP_VERSION_2_0, or 0 if the version can't be determined.
+.SH PROTOCOLS
+HTTP
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  CURLcode res;
+  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
+  res = curl_easy_perform(curl);
+  if(res == CURLE_OK) {
+    long http_version;
+    curl_easy_getinfo(curl, CURLINFO_HTTP_VERSION, &http_version);
+  }
+  curl_easy_cleanup(curl);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.50.0
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLINFO_RESPONSE_CODE "(3), "
+.BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "
diff --git a/docs/libcurl/symbols-in-versions b/docs/libcurl/symbols-in-versions
index fa26efbe7..d05a46904 100644
--- a/docs/libcurl/symbols-in-versions
+++ b/docs/libcurl/symbols-in-versions
@@ -223,6 +223,7 @@ CURLINFO_HEADER_SIZE            7.4.1
 CURLINFO_HTTPAUTH_AVAIL         7.10.8
 CURLINFO_HTTP_CODE              7.4.1         7.10.8
 CURLINFO_HTTP_CONNECTCODE       7.10.7
+CURLINFO_HTTP_VERSION           7.50.0
 CURLINFO_LASTONE                7.4.1
 CURLINFO_LASTSOCKET             7.15.2
 CURLINFO_LOCAL_IP               7.21.0
diff --git a/include/curl/curl.h b/include/curl/curl.h
index 57e716b3e..b9bd8b706 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -2193,9 +2193,10 @@ typedef enum {
   CURLINFO_TLS_SESSION      = CURLINFO_SLIST  + 43,
   CURLINFO_ACTIVESOCKET     = CURLINFO_SOCKET + 44,
   CURLINFO_TLS_SSL_PTR      = CURLINFO_SLIST  + 45,
+  CURLINFO_HTTP_VERSION     = CURLINFO_LONG   + 46,
   /* Fill in new entries below here! */
 
-  CURLINFO_LASTONE          = 45
+  CURLINFO_LASTONE          = 46
 } CURLINFO;
 
 /* CURLINFO_RESPONSE_CODE is the new name for the option previously known as
diff --git a/lib/getinfo.c b/lib/getinfo.c
index d4b01bf29..956a72454 100644
--- a/lib/getinfo.c
+++ b/lib/getinfo.c
@@ -198,6 +198,22 @@ static CURLcode getinfo_long(struct SessionHandle *data, CURLINFO info,
   case CURLINFO_RTSP_CSEQ_RECV:
     *param_longp = data->state.rtsp_CSeq_recv;
     break;
+  case CURLINFO_HTTP_VERSION:
+    switch (data->info.httpversion) {
+    case 10:
+      *param_longp = CURL_HTTP_VERSION_1_0;
+      break;
+    case 11:
+      *param_longp = CURL_HTTP_VERSION_1_1;
+      break;
+    case 20:
+      *param_longp = CURL_HTTP_VERSION_2_0;
+      break;
+    default:
+      *param_longp = CURL_HTTP_VERSION_NONE;
+      break;
+    }
+    break;
 
   default:
     return CURLE_UNKNOWN_OPTION;
diff --git a/src/tool_writeout.c b/src/tool_writeout.c
index 414fcbea9..6e94afe42 100644
--- a/src/tool_writeout.c
+++ b/src/tool_writeout.c
@@ -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
@@ -57,6 +57,7 @@ typedef enum {
   VAR_PRIMARY_PORT,
   VAR_LOCAL_IP,
   VAR_LOCAL_PORT,
+  VAR_HTTP_VERSION,
   VAR_NUM_OF_VARS /* must be the last */
 } replaceid;
 
@@ -95,6 +96,7 @@ static const struct variable replacements[]={
   {"remote_port", VAR_PRIMARY_PORT},
   {"local_ip", VAR_LOCAL_IP},
   {"local_port", VAR_LOCAL_PORT},
+  {"http_version", VAR_HTTP_VERSION},
   {NULL, VAR_NONE}
 };
 
@@ -278,6 +280,26 @@ void ourWriteOut(CURL *curl, struct OutStruct *outs, const char *writeinfo)
                                      &longinfo))
                   fprintf(stream, "%ld", longinfo);
                 break;
+              case VAR_HTTP_VERSION:
+                if(CURLE_OK ==
+                   curl_easy_getinfo(curl, CURLINFO_HTTP_VERSION,
+                                     &longinfo)) {
+                  const char *version = "0";
+                  switch (longinfo) {
+                  case CURL_HTTP_VERSION_1_0:
+                    version = "1.0";
+                    break;
+                  case CURL_HTTP_VERSION_1_1:
+                    version = "1.1";
+                    break;
+                  case CURL_HTTP_VERSION_2_0:
+                    version = "2";
+                    break;
+                  }
+
+                  fprintf(stream, version);
+                }
+                break;
               default:
                 break;
               }