问题

I am trying to make LINK FINDER app in ASP
It working is divided into 5 step

Send http request to server at www.foo.com
Check status of request
If its 200 then move to step 4 otherwise show error
Parse all link
Send http request to server to parsed link

I am able to do first 4 step, But facing challenge in 5th step

I am getting 3 type of links

1.)absolute link : http://www.foo.com/file.asp
2.)links from root directory, which need domain name eg /folder2/file2.asp
3.)relative link : ../file3.asp

Challenge

When I am requesting www.foo.com , which is 301 redirected to www.foo.com/folder3/folder3/file3.asp

I am getting html content of redirected page, But don't get redirected url and not able to check 3rd type of links

Using following code

Set ServerXmlHttp = Server.CreateObject("MSXML2.ServerXMLHTTP.6.0")
ServerXmlHttp.open "GET", "http://www.foo.com"
ServerXmlHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
ServerXmlHttp.send PostData
If ServerXmlHttp.status = 200 Then
 //My CODE

Hope for quick response... or any other idea for link finder in asp , vb.net

回答1:

It's out of the ServerXMLHTTP capabilities.
Instead you have to use IWinHttpRequest or another third-party component that able to manage redirects.
In the following example, req.Option(WHR_URL) returns the current url even if redirected.
Option req.option(WHR_EnableRedirects) is True by default like ServerXMLHTTP.
So, I've added a line commented out showing how to disable redirects.

Const WHR_URL = 1
Const WHR_EnableRedirects = 6
'Enum constants are listed at http://msdn.microsoft.com/en-us/library/windows/desktop/aa384108(v=vs.85).aspx
Dim req
Set req = Server.CreateObject("WinHttp.WinHttpRequest.5.1")
    'req.Option(WHR_EnableRedirects) = False 'don't follow the redirects
    req.open "GET", "http://www.foo.com", False
    req.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
    req.send PostData
If req.Status = 200 Then
    Response.Write "Last URL : " & req.Option(WHR_URL)
End If

来源：https://stackoverflow.com/questions/20358654/serverxmlhttp-request-returing-data-but-not-returning-url-of-final-page-after-30

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vb.net