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Dim userInfo As New localhost.UserInfoHeader()
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This is the identifier for the Italian language.
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userInfo.Culture = it-it"
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Italian time is one hour ahead of Greenwich time.
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userInfo.TimeOffset = 1
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Create an instance of the proxy class.
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Dim service As New localhost.SampleService()
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Assign the header to the special xxxxValue field.
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service.UserInfoHeaderValue = userInfo
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Call the Web service.
Dim res As String = service.GetClientTime()
Web Services
Under .NET 1.0, the SoapHeader attribute makes the header mandatory, and the client gets an exception if no header is associated with the proxy object, but you can make the header optional by adding a Required argument set to False. Under .NET 1.1, the Required argument is ignored, and SOAP headers are always optional. Therefore, under .NET 1.1, either you must ensure that the code in the Web service method works well even if the client doesn t send a header or you must manually throw an exception if the client didn t send a header that is strictly necessary to process the method call:
You can omit the Required argument under .NET 1.1. <WebMethod(), SoapHeader( userInfo", Required:=False)> _ Function GetClientTime() As String Provide a default userInfo object if the client omitted it. If userInfo Is Nothing Then userInfo = New UserInfoHeader() In this case, UTC time is returned to the client. End If End Function
By default, headers are sent to the Web service but aren t returned to the client to save bandwidth. In other words, the header object works as an input-only argument for the Web service method. It doesn t have to be so, however, and you have complete control over how headers are sent back and forth. The key to this feature is the Direction argu ment of the SoapHeader attribute: its default value is In, but you can set it to InOut or Out. .NET Framework 1.1 supports a fourth value, Fault; you can add this value to any of the other three if you want to return the SOAP header to the client even when the Web service throws an exception.
<WebMethod(), SoapHeader( userInfo", Required:=False, _ Direction:=SoapHeaderDirection.InOut)> _ Function GetClientTime() As String Provide a default userInfo object if the client omitted it. If userInfo Is Nothing Then (This header is returned to the client.)
userInfo = New UserInfoHeader()
userInfo.Culture = EN-US American English
userInfo.TimeOffset = -5 U.S. eastern time
Part VI:
Internet Applications
End If End Function
I ll illustrate other uses for SOAP headers shortly, in the section Custom Authentication.
Web Service Security
Web service security doesn t differ noticeably from standard ASP.NET security, and all the security mechanisms you saw in 27 are valid with Web services. The pecu liarities in Web service security stem from their noninteractive nature. For example, if you disable anonymous access for an .asmx file from inside IIS, any client request for that .asmx file fails, but no dialog box is displayed. Another consequence of the programmatic nature of Web services: you can use Forms authentication and redirect all nonauthenticated requests to a given URL (using the Log inURL entry in web.config), but this tactic is of no practical use because the Web service client would receive HTML instead of the SOAP message it s expecting. Although this obstacle might be removed if you provided a custom function that manually creates the authentication cookie, in general Forms authentication isn t recommended as a viable authentication method for Web services, and I won t cover it in this book.
Windows Authentication
Windows authentication is the simplest authentication method you can use for a Web service that can t accept anonymous requests. Whether or not you ve protected the .asmx page with Basic, Digest, or Integrated Windows authentication, you can provide your credentials to IIS by assigning a NetworkCredential object to the proxy object s Credential property, as in this code snippet:
Create a System.Net.NetworkCredential object.
Dim nc As New NetworkCredential()
nc.UserName = username"
nc.Password = userpwd"
nc.Domain = domainname"
Create the proxy object and assign it the user credentials.
Dim service As New localhost.Converter()
service.Credentials = nc
Make the call.
Dim euros As Decimal = service.DollarToEuro(100)
If the .asmx page requires Windows authentication and you pass invalid credentials (or no credentials at all), the client application receives a WebException object whose Message property is this:
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