Question

我试图创建一个HTTPHandler来验证某些静态资源，在这种情况下是PDF文件。

我已将以下内容添加到web.config：

<configuration>
  <system.web>
    <httpHandlers>
      <clear />
      <add path="*.pdf" verb="*" validate="true" type="AuthenticatedStaticResourceHandler" />
    </httpHandlers>
  </system.web>
</configuration>

这是我的HTTPHandler类：

Imports Microsoft.VisualBasic

Public Class AuthenticatedStaticResourceHandler
    Implements IHttpHandler

    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        Dim resource As String = String.Empty

        Select Case context.Request.HttpMethod
            Case "GET"
                resource = context.Server.MapPath(context.Request.FilePath)
                If Helpers.User.CanAccessPath(context.Request.FilePath, context.User.Identity.Name) Then
                    SendContentTypeAndFile(context, resource)
                Else
                    FormsAuthentication.RedirectToLoginPage()
                End If
        End Select
    End Sub

    Public ReadOnly Property IsReusable As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

    Private Function SendContentTypeAndFile(ByVal context As HttpContext, ByVal file As String) As HttpContext
        context.Response.ContentType = GetContentType(file)
        context.Response.TransmitFile(file)
        context.Response.End()

        Return context
    End Function

    Private Function GetContentType(ByVal filename As String) As String
        'Used to set the encoding for the reponse stream 
        Dim resource As String = String.Empty
        Dim file As System.IO.FileInfo = New System.IO.FileInfo(filename)

        If file.Exists Then
            Select Case file.Extension.Remove(0, 1).ToLower()
                Case "pdf"
                    resource = "application/pdf"
                Case "jpg"
                    resource = "image/jpg"
                Case "gif"
                    resource = "image/gif"
                Case "png"
                    resource = "image/png"
                Case "css"
                    resource = "text/css"
                Case "js"
                    resource = "text/javascript"
                Case Else
                    resource = String.Empty
            End Select
        End If

        Return IIf(resource.Length > 0, resource, Nothing)
    End Function
End Class

我在Select Case context.Request.HttpMethod的{{1}}行设置了一个断点，但是当我尝试访问ProcessRequest时，不会触发断点。此外，尝试访问的示例PDF I埋藏在我无法访问的文件夹中，但是PDF已经提供。

这让我相信我的HTTPHandler没有被调用。

我错过了什么吗？我做错了什么？

Answer 1

最有可能的是，您必须在web.config中添加一个额外的部分以支持所有版本的IIS。

对于IIS7及更高版本，您需要在system.webServer部分注册处理程序：

<system.webServer>
    <handlers>
        <add ... />
    </handlers>
</system.webServer>

自定义HTTPHandler未被调用

1 个答案: