From: ParappaYo <parappayo@...>
Date: 2006-12-07T09:10:08+09:00
Subject: Using Ruby Web Service from a C# .NET Client

I'm trying to set up a sample project of a Ruby web service consumed by
a C# .NET client.  I know that lots of people have managed to use an
ASP .NET service from a Ruby client, but I am trying to do it the other
way around.  To keep things super simple, I'm just trying to get the
following web service to work:

<code>
require 'soap/rpc/standaloneServer'

NS = 'http://bushidoburrito.com/WebServiceTest'

class TestStuff
   def test_string()
       "blah blah"
   end
end

class TestServer < SOAP::RPC::StandaloneServer
   def on_init
       test_stuff = TestStuff.new
       add_method(test_stuff, 'test_string')
   end
end

serv = TestServer.new('WebServiceTest', NS, '0.0.0.0', 8080)
trap('INT') { serv.shutdown }
serv.start
</code>

So far as I know, RPC::StandaloneServer doesn't support WSDL (at least,
I couldn't figure out how to get it), so I built my own proxy class in
C#:

<code>
using System;
using System.Diagnostics;
using System.Xml.Serialization;
using System.Web.Services;
using System.Web.Services.Protocols;

namespace WebServiceTestClient
{

[System.Web.Services.WebServiceBindingAttribute(Name="WebServiceTestSoap",
                Namespace="http://bushidoburrito.com/WebServiceTest")]
       public class WebServiceTestServer :
System.Web.Services.Protocols.SoapHttpClientProtocol
       {
               public WebServiceTestServer()
               {
                       this.Url = "http://localhost:8080/";
               }


[System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://bushidoburrito.com/WebServiceTest/test_string",

RequestNamespace="http://bushidoburrito.com/WebServiceTest",

ResponseNamespace="http://bushidoburrito.com/WebServiceTest",

Use=System.Web.Services.Description.SoapBindingUse.Literal,

ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
               public string test_string()
               {
                       object[] results = this.Invoke("test_string",
new object[0]);
                       return (string) results[0];
               }
       }
}
</code>

When I call the web service on the client side, the results array has a
length of 1 but results[0] is always null.  I ran TcpTrace on localhost
with both the web service and the client running locally to capture the
traffic between them.

The request:

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client
Protocol 1.1.4322.2032)
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://bushidoburrito.com/WebServiceTest/test_string"
Content-Length: 310
Expect: 100-continue
Connection: Keep-Alive
Host: localhost:8081

<?xml version="1.0" encoding="utf-8"?><soap:Envelope
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><test_string
xmlns="http://bushidoburrito.com/WebServiceTest"
/></soap:Body></soap:Envelope>

---
And now the response:

HTTP/1.1 200 OK
Connection: Keep-Alive
Date: Wed, 06 Dec 2006 20:41:11 GMT
Content-Type: text/xml; charset="utf-8"
Server: WEBrick/1.3.1 (Ruby/1.8.2/2004-12-25)
Content-Length: 494

<?xml version="1.0" encoding="utf-8" ?>
<env:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <env:Body>
   <n1:test_stringResponse
xmlns:n1="http://bushidoburrito.com/WebServiceTest"
       env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
     <return xsi:type="xsd:string">blah blah</return>
   </n1:test_stringResponse>
 </env:Body>
</env:Envelope>

---
I don't know much about SOAP, but it seems to me that the Ruby web
service part is working just fine.  Is the problem entirely with the
.NET client, then?  And either way, is there anything that I can do to
fix it?