"Hello world" ending with HTTP500 error : ASP works fine but WebServices don't

[Emmanuel DURAND]

Hi,

I (also) have created Webservice project in Visual Studio 2003, by default
it is
created the Service.asmx file with the code as

[WebMethod]
public string HelloWorld() {
return "Hello World";
}

I can build this project, I can see first and second pages of asp result
(meaning list of methods and method test button), but when
choose HelloWorld test button I get an HTTP 500 error (internal server
error).
When I refresh (F5) the HTML error page, I get more information you can read
below.

I use .NET 1.1.4, IIS5 and don't understand what happends.

Thanks in advance.

Regards


Stack
[InvalidOperationException: Format de demande non reconnu.] (unknown demand
format)

System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type
type, HttpContext context, HttpRequest request, HttpResponse response)

System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContex
t context, String verb, String url, String filePath)
System.Web.HttpApplication.MapHttpHandler(HttpContext context, String
requestType, String path, String pathTranslated, Boolean useAppConfig) +699

System.Web.MapHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep
..Execute() +95
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously) +173