(Xojo Plugin) Manually Follow HTTP Redirects

Demonstrates how to manually follow redirects for an HTTP GET.

Note: This example requires Chilkat v11.0.0 or greater.

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Dim success As Boolean
success = False

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http

// The FollowRedirects property controls whether redirects
// are automatically followed.  The default behavior is to
// automatically follow redirects.

// Explicitly set FollowRedirects so that redirects are NOT automatically taken:
http.FollowRedirects = False

Dim resp As New Chilkat.HttpResponse
success = http.HttpNoBody("GET","http://yandex.ru/",resp)
If (success = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim status As Int32
status = resp.StatusCode
System.DebugLog("HTTP Response Status: " + Str(status))

// The FinalRedirectUrl property will contain the redirect URL
// If FollowRedirects was equal to True, then all of the 
// intermediate redirects (if any) would be followed until
// there were no more redirects.  However, because 
// FollowRedirects is not True, FinalRedirectUrl contains
// the next redirect URL.

Dim loopCount As Int32
loopCount = 0

While (status = 302)

    System.DebugLog("Redirect URL: " + http.FinalRedirectUrl)

    Dim nextUrl As String
    nextUrl = http.FinalRedirectUrl
    success = http.HttpNoBody("GET",nextUrl,resp)
    If (success = False) Then
        System.DebugLog(http.LastErrorText)
        Return
    End If

    status = resp.StatusCode
    System.DebugLog("HTTP Response Status: " + Str(status))

    // For safety, prevent infinite loops by
    // keeping a loopCount and only allows following a max 
    // of 10 redirects:
    loopCount = loopCount + 1
    If (loopCount > 10) Then
        System.DebugLog("Too many redirects.")
        Return
    End If

Wend