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利用XMLHTTP检测或监测URL，确认某个网页或网站是否可以正常访问？
如何利用XMLHTTP探测服务器信息？检测网页
Microsoft XML Version 2.0 (C:WinntSystem32msxml.dll)

Option Explicit

Private XmlHTTP As New XMLHTTPRequest
Private vUrl As String
Private vNumber As String
Private vDescription As String
Private vSource As String

Public Sub Connect()

On Error GoTo ErrorHandle:

XmlHTTP.Open \”Get\”, Url, False
XmlHTTP.send

ErrorHandle:
Call GetErrorHeadle(XmlHTTP)
End Sub

Private Sub GetErrorHeadle(ByRef XmlHTTP As XMLHTTPRequest)
If XmlHTTP.readyState <> 4 Then
Exit Sub
End If

If XmlHTTP.Status = 404 Then
Number = \”404\”
Description = \”该网页不存在\”
ElseIf XmlHTTP.Status < 200 Then
Number = XmlHTTP.Status
Description = \”客户端错误，信息：\” & CStr(XmlHTTP.Status) & \” \” & XmlHTTP.statusText
ElseIf XmlHTTP.Status < 300 Then
Number = XmlHTTP.Status
Description = \”成功，该网页能访问。\”
ElseIf XmlHTTP.Status < 400 Then
Number = XmlHTTP.Stauts
Description = \”重定向，信息：\” & CStr(XmlHTTP.Status) & \” \” & XmlHTTP.statusText
ElseIf XmlHTTP.Status < 500 Then
Number = XmlHTTP.Status
Description = \”客户端错误，信息：\” & CStr(XmlHTTP.Status) & \” \” & XmlHTTP.statusText
ElseIf XmlHTTP.Status < 600 Then
Number = XmlHTTP.Status
Description = \”服务器错误，信息：\” & CStr(XmlHTTP.Status) & \” \” & XmlHTTP.statusText
Else
Number = XmlHTTP.Status
Description = \”域名不可用或网络连接错误，信息：\” & CStr(XmlHTTP.Status) & \” \” & XmlHTTP.statusText
End If

If XmlHTTP.Status < 600 Then Call GetHTTPServer
End Sub

Private Sub GetHTTPServer()
Dim XmlServer As String
XmlServer = XmlHTTP.getResponseHeader(\”Server\”)
If XmlServer <> \”\” Then
Source = Source & \”HTTP服务器：\” & XmlServer
End If
Source = Source & \”所有反馈信息：\” & XmlHTTP.getAllResponseHeaders
End Sub

Public Property Get Number() As String
Number = vNumber
End Property
Public Property Let Number(ByVal Val As String)
vNumber = Val
End Property

Public Property Get Description() As String
Description = vDescription
End Property
Public Property Let Description(ByVal Val As String)
vDescription = Val
End Property

Public Property Get Url() As String
Url = vUrl
End Property
Public Property Let Url(ByVal Val As String)
vUrl = Val
End Property

Public Property Get Source() As String
Source = vSource
End Property
Private Property Let Source(ByVal Val As String)
vSource = Val
End Property