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GSOAP WININET PLUGIN
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Allow gsoap clients (not servers) to direct all communications through the 
WinInet API. This automatically provides all of the proxy and authentication 
features supported by the control panel 'Internet Options' dialog to the 
client. As these options are shared by IE, this means that "if IE works, 
gsoap works."

Project Home: http://code.google.com/p/gsoapwininet/

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Features
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 + gsoap plugin - extremely easy to use
 + complete support for:
     - HTTP/1.0 and HTTP/1.1
     - HTTPS (no extra libraries are required)
     - HTTP authentication
     - Proxy servers (simple, automatic discovery, etc)
     - Proxy authentication (basic, NTLM, etc)
 + authentication prompts and HTTPS warnings (e.g. invalid HTTPS CA) 
     can be resolved by the user via standard system dialog boxes.
 + message size is limited only by available memory
 + connect, receive and send timeouts are used 
 + supports all SOAP_IO types (see limitations)
 + written completely in C, can be used in C, C++, and MFC projects
     without modification (anywhere that gsoap is used)
 + can be used in both MBCS and UNICODE projects
 + compiles cleanly at warning level 4 (if gsoap uses SOAP_SOCKET
     for the definition of sockets instead of int, it will also
     compile without win64 warnings).
 + all debug trace goes to the gsoap TEST.log file 
 + supports multiple threads (all plugin data is stored in the 
     soap structure - no static variables)

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Limitations
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 - DIME attachments are not supported
 - may internally buffer the entire outgoing message before sending
     (if the serialized message is larger then SOAP_BUFLEN, or if 
     SOAP_IO_CHUNK mode is being used then the entire message will 
     be buffered)

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Usage
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Add the gsoapWinInet2.h and gsoapWinInet2.cpp files to your project (if you 
have a C project, rename gsoapWinInet2.cpp to .c and use it as is). Ensure 
that you turn off precompiled headers for the .cpp file.

In your source, just after calling soap_init(), register this plugin with 
soap_register_plugin( soap, wininet_plugin ). 

For example:
     struct soap soap;
     soap_init( &soap );
     soap_register_plugin( &soap, wininet_plugin );
     soap.connect_timeout = 5; // this will be used by wininet too
     ...
     soap_done(&soap);

IMPORTANT: make sure to compile all sources in C++ compilation mode. If you
migrate to a project file .vcproj, please set CompileAs="2" in your .vcproj
file.

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Notes
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For extra control, you may also register this plugin using the 
soap_register_plugin_arg() function, and supply as the argument flags which 
you want to be passed to HttpOpenRequest. 

For example:
     struct soap soap;
     soap_init( &soap );
     soap_register_plugin_arg( &soap, wininet_plugin,
         (void*) INTERNET_FLAG_IGNORE_CERT_CN_INVALID );

See the MSDN documentation on HttpOpenRequest for details of available flags. 
The <wininet.h> header file is required for the definitions of the flags. 
Some flags which may be useful are:

INTERNET_FLAG_KEEP_CONNECTION

     Uses keep-alive semantics, if available, for the connection. 
     This flag is required for Microsoft Network (MSN), NT LAN 
     Manager (NTLM), and other types of authentication. 
     ++ Note that this flag is used automatically when soap.omode 
     has the SOAP_IO_KEEPALIVE flag set. ++

INTERNET_FLAG_IGNORE_CERT_CN_INVALID

     Disables Microsoft Win32 Internet function checking of SSL/PCT-
     based certificates that are returned from the server against 
     the host name given in the request. 

INTERNET_FLAG_IGNORE_CERT_DATE_INVALID

     Disables Win32 Internet function checking of SSL/PCT-based 
     certificates for proper validity dates.

This plugin uses the following callback functions and is not compatible 
with any other plugin that uses these functions.

     soap->fopen
     soap->fposthdr
     soap->fsend
     soap->frecv
     soap->fclose

If there are errors in sending the HTTP request which would cause a dialog 
box to be displayed in IE (for instance, invalid certificates on an HTTPS 
connection), then a dialog will also be displayed by this library. At the 
moment is is not possible to disable the UI. If you wish to remove the UI 
then you will need to hack the source to remove the dialog box and resolve the
errors programmatically, or supply the appropriate flags in 
soap_register_plugin_arg() to disable the unwanted warnings.

Because messages are buffered internally to gsoapWinInet2 plugin it is 
recommended that the SOAP_IO_STORE flag is not used otherwise the message may 
be buffered twice on every send. Use the default flag SOAP_IO_BUFFER, 
or SOAP_IO_FLUSH.

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License 
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The licence text below is the boilerplate "MIT Licence" used from:
http://www.opensource.org/licenses/mit-license.php

Copyright (c) 2009, Brodie Thiesfield

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is furnished
to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Developers
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26 May 2003: Jack Kustanowitz (jackk@atomica.com)
Original version

29 September 2003: Brodie Thiesfield (code@jellycan.com)
Rewritten as C plugin for gsoap. Bugs fixed and features added.

14 January 2004: Brodie Thiesfield (code@jellycan.com)
Bug fix.

17 March 2009: Brodie Thiesfield (code@jellycan.com)
Clean up and re-release.

8 October 2010: Robert van Engelen (engelen@acm.org)
Fix for error handling.

