在我提出这个问题之前就已经开始了Google搜索,但只有在检查了this之后才进行了检查,这也表明我已经走上了正确的道路.

此外,我还要问一下我的观点暗示的问题,即响应必须是XML,关于什么是最好的方法,但我找到了答案here.

总之,最终的代码是：

Protected Sub Page_Load(ByVal sender As Object,ByVal e As System.EventArgs) Handles Me.Load

    If Request.ContentType <> "text/xml" Then _
        Throw New HttpException(500,"Unexpected Content-Type")

    Dim id = CheckBasicAuthentication

    Dim textReader = New IO.StreamReader(Request.InputStream)

    CheckXmlValidity(textReader)

    ' Reset the stream & reader
    Request.InputStream.Seek(0,IO.SeekOrigin.Begin)
    textReader.DiscardBufferedData()

    Dim xmlIn = XDocument.Load(textReader)

    ' process XML in xmlIn

    Dim xmlOut = <?xml version="1.0" encoding="UTF-8" ?>
                 <someresult>
                     <header>
                         <id><%= id.ToString() %></id>
                         <datestamp>To be inserted</datestamp>
                     </header>
                     <result/>
                 </someresult>

    ' Further generation of XML for output

    xmlOut.<someresult>.<header>.<datestamp>.Value = Date.UtcNow.ToString(xmlDateFormat)
    xmlText.Text = xmlOut.ToString
End Sub

Private Function CheckBasicAuthentication() As Integer
    Dim httpAuthorisation = Request.Headers("Authorization")
    If Left(httpAuthorisation,6).ToUpperInvariant <> "BASIC " Then _
        Throw New HttpException(401,"Basic Authentication required")
    Dim authorization = Convert.FromBase64String(Mid(httpAuthorisation,7))
    Dim credentials = Text.Encoding.UTF8.GetString(authorization).Split(":"c)
    Dim username = credentials(0)
    Dim password = credentials(1)

    Return ConfirmValidUser(username,password)
End Function

Private Shared Sub CheckXmlValidity(ByVal textReader As System.IO.StreamReader)
    Try
        ' Check for "interesting" xml documents.
        Dim settings = New System.Xml.XmlReaderSettings()
        settings.XmlResolver = Nothing
        settings.MaxCharactersInDocument = 655360
        ' Successfully parse the file,otherwise an XmlException is to be thrown. '
        Dim reader = System.Xml.XmlReader.Create(textReader,settings)
        Try
            While reader.Read()
                'Just checking.
            End While
        Finally
            reader.Close()
        End Try
    Catch ex As Exception
        Throw New HttpException(500,"Invalid Xml data",ex)
    End Try
End Sub

和ASP.NET webpage.aspx是：

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="webpage.aspx.vb" Inherits="WebPage" ContentType="text/xml" %>

<asp:Literal ID="xmlText" runat="server" Mode="PassThrough"></asp:Literal>

NB抛出HTTPException不是有害场景的有效最终解决方案.