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(Xojo Plugin) Manually Follow HTTP Redirects

Demonstrates how to manually follow redirects for an HTTP GET.

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// 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 Chilkat.HttpResponse
resp = http.QuickGetObj("http://yandex.ru/")
If (http.LastMethodSuccess = 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)

    // IMPORTANT: This example requires Chilkat v9.5.0.49 or greater because
    // the FinalRedirectUrl in prior versions is only set when redirects
    // are automatically followed.   Starting in v9.5.0.49, the FinalRedirectUrl is
    // set to the next redirect URL when a 301/302 response is received, regardless
    // of the value of the FollowRedirects property.
    System.DebugLog("Redirect URL: " + http.FinalRedirectUrl)

    Dim nextUrl As String
    nextUrl = http.FinalRedirectUrl
    resp = http.QuickGetObj(nextUrl)
    If (http.LastMethodSuccess = 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

 

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