New libcurl option to keep sending on error

Add the new option CURLOPT_KEEP_SENDING_ON_ERROR to control whether
sending the request body shall be completed when the server responds
early with an error status code.

This is suitable for manual NTLM authentication.

Reviewed-by: Jay Satiro

Closes https://github.com/curl/curl/pull/904

3 files changed, 56 insertions, 1 deletions

diff --git a/docs/libcurl/opts/CURLOPT_FAILONERROR.3 b/docs/libcurl/opts/CURLOPT_FAILONERROR.3
index 79474cefd..93d8ba6ed 100644
--- a/docs/libcurl/opts/CURLOPT_FAILONERROR.3
+++ b/docs/libcurl/opts/CURLOPT_FAILONERROR.3
@@ -53,4 +53,4 @@ Along with HTTP
 .SH RETURN VALUE
 Returns CURLE_OK if HTTP is enabled, and CURLE_UNKNOWN_OPTION if not.
 .SH "SEE ALSO"
-.BR CURLOPT_HTTP200ALIASES "(3), "
+.BR CURLOPT_HTTP200ALIASES "(3), " CURLOPT_KEEP_SENDING_ON_ERROR "(3), "
diff --git a/docs/libcurl/opts/CURLOPT_KEEP_SENDING_ON_ERROR.3 b/docs/libcurl/opts/CURLOPT_KEEP_SENDING_ON_ERROR.3
new file mode 100644
index 000000000..4ddd8687c
--- /dev/null
+++ b/docs/libcurl/opts/CURLOPT_KEEP_SENDING_ON_ERROR.3
@@ -0,0 +1,52 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  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 CURLOPT_KEEP_SENDING_ON_ERROR 3 "22 Sep 2016" "libcurl 7.51.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_KEEP_SENDING_ON_ERROR \- keep sending on early HTTP response >= 300
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_KEEP_SENDING_ON_ERROR, long keep_sending);
+.SH DESCRIPTION
+A long parameter set to 1 tells the library to keep sending the request body
+if the HTTP code returned is equal to or larger than 300. The default action
+would be to stop sending and close the stream or connection.
+
+This option is suitable for manual NTLM authentication, i.e. if an application
+does not use \fICURLOPT_HTTPAUTH(3)\fP, but instead sets "Authorization: NTLM ..."
+headers manually using \fICURLOPT_HTTPHEADER(3)\fP.
+
+Most applications do not need this option.
+
+.SH DEFAULT
+0, stop sending on error
+.SH PROTOCOLS
+HTTP
+.SH EXAMPLE
+TODO
+.SH AVAILABILITY
+Along with HTTP
+.SH RETURN VALUE
+Returns CURLE_OK if HTTP is enabled, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_FAILONERROR "(3), " CURLOPT_HTTPHEADER "(3), "
diff --git a/docs/libcurl/opts/Makefile.am b/docs/libcurl/opts/Makefile.am
index a3fc0647f..e67364ccc 100644
--- a/docs/libcurl/opts/Makefile.am
+++ b/docs/libcurl/opts/Makefile.am
@@ -170,6 +170,7 @@ man_MANS =                                      \
  CURLOPT_IOCTLFUNCTION.3                        \
  CURLOPT_IPRESOLVE.3                            \
  CURLOPT_ISSUERCERT.3                           \
+ CURLOPT_KEEP_SENDING_ON_ERROR.3                \
  CURLOPT_KEYPASSWD.3                            \
  CURLOPT_KRBLEVEL.3                             \
  CURLOPT_LOCALPORT.3                            \
@@ -457,6 +458,7 @@ HTMLPAGES =                                     \
  CURLOPT_IOCTLFUNCTION.html                     \
  CURLOPT_IPRESOLVE.html                         \
  CURLOPT_ISSUERCERT.html                        \
+ CURLOPT_KEEP_SENDING_ON_ERROR.html             \
  CURLOPT_KEYPASSWD.html                         \
  CURLOPT_KRBLEVEL.html                          \
  CURLOPT_LOCALPORT.html                         \
@@ -744,6 +746,7 @@ PDFPAGES =                                      \
  CURLOPT_IOCTLFUNCTION.pdf                      \
  CURLOPT_IPRESOLVE.pdf                          \
  CURLOPT_ISSUERCERT.pdf                         \
+ CURLOPT_KEEP_SENDING_ON_ERROR.pdf              \
  CURLOPT_KEYPASSWD.pdf                          \
  CURLOPT_KRBLEVEL.pdf                           \
  CURLOPT_LOCALPORT.pdf                          \