#Value error on Winhttp.Winhttprequest in Excel VBA - vba

Question

I have written some code to retrieve url, but i am getting #Value error. Is anything wrong in this code,
Public Function Rurl(ByVal URL As String)
Dim http As Object
Set http = CreateObject("WinHttp.WinHttpRequest.5.1")
http.Option(WinHttpRequestOption_UserAgentString) = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"
http.Option(WinHttpRequestOption_EnableRedirects) = True
If Not InStr(URL, "://") > 0 Then URL = "http://" & URL
http.Open "GET", URL
http.Send
Rurl = http.GetResponseHeader("Location")
Set http = Nothing
End function

Answer 1

You don't say where you're getting the error, so I'm going to assume it's at this line:
Rurl = http.GetResponseHeader("Location")
Something to ask yourself: what will your code do if the site at the supplied URL doesn't redirect?
The answer is that your code will give you an error at the above line which you don't handle anywhere in your code, very likely resulting in the #VALUE! error that you're seeing.
I'd suggest adding some error checking to ensure your function works in all situations. So, give this a go:
Public Function Rurl(ByVal URL As String)
On Error GoTo ErrorHandler
Dim http As Object
Set http = CreateObject("WinHttp.WinHttpRequest.5.1")
http.Option(WinHttpRequestOption_UserAgentString) = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"
http.Option(WinHttpRequestOption_EnableRedirects) = True
If Not InStr(URL, "://") > 0 Then URL = "http://" & URL
http.Open "GET", URL
http.Send
Rurl = http.GetResponseHeader("Location")
Set http = Nothing
Exit Function
ErrorHandler:
Rurl = "" ' or you can say something like: "No redirection".
Resume Next
End Function
If an error occurs anywhere in your function, the error handler will set the return value of your function to something sensible, clean up and exit the function. If no error occurs, everything should work like before. We're just adding a bit of code to handle potential errors.

Answer 2

trap for the 302 status code then get the Location variable from the http header.
strUrl = "https://xx123.abc.com/"
Dim http As Object
Set http = CreateObject("WinHttp.WinHttpRequest.5.1")
With http
.Open "GET", strUrl, False
.setRequestHeader "Content-Type", "text/css" '"application/x-www-form-urlencoded"
.setRequestHeader "User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0"
.Option(WinHttpRequestOption_EnableRedirects) = False
.Send
d = .waitForResponse()
If (.Status = 302) Then
temp = .responseText
headers = .getAllResponseHeaders()
cookie = .getResponseHeader("Set-Cookie")
redirectedURL = .getResponseHeader("Location")
End If
End With