HTTP Redirect Handling

Examine HTTP redirects.

Download Chilkat HTTP ActiveX

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int

    --  Any string unlocks the component for the 1st 30-days.
    EXEC sp_OAMethod @http, 'UnlockComponent', @success OUT, 'Anything for 30-day trial'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    DECLARE @url nvarchar(4000)

    DECLARE @html nvarchar(4000)

    DECLARE @status int

    SELECT @url = 'http://www.planyourweddingonline.co.za/'

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

    --  Explicitly set FollowRedirects so that redirects are automatically taken:
    EXEC sp_OASetProperty @http, 'FollowRedirects', 1

    --  Send the HTTP GET and return the content in a string.
    EXEC sp_OAMethod @http, 'QuickGetStr', @html OUT, @url
    IF @html Is Nothing 
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
      END

    --  On success, LastErrorText will provide information about
    --  what happened during the call.
    PRINT '--------------- LastErrorText ------------------'
    EXEC sp_OAGetProperty @http, 'LastErrorText', @iTmp0 OUT
    PRINT @iTmp0
    PRINT '------------------------------------------------'

    --  In this case, we see something like this:
    --  ChilkatLog:
    --    QuickGetHtml:
    --      DllDate: Jul 27 2007
    --      url: http://www.planyourweddingonline.co.za/
    --      httpServer: www.planyourweddingonline.co.za
    --      port: 80
    --      StatusCode: 302
    --      StatusText: Found
    --      Reading chunked response
    --      redirectUrl: main/main/home/index.php
    --      url: http://www.planyourweddingonline.co.za/main/main/home/index.php
    --      StatusCode: 302
    --      StatusText: Found
    --      Reading chunked response
    --      redirectUrl: /main/main/home/index.php?SMC=1
    --      url: http://www.planyourweddingonline.co.za/main/main/home/index.php?SMC=1
    --      StatusCode: 200
    --      StatusText: OK
    --      CompressedSize: 7434
    --      UncompressedSize: 40999

    --  Was the GET redirected?
    EXEC sp_OAGetProperty @http, 'WasRedirected', @iTmp0 OUT
    IF @iTmp0 = 1
      BEGIN
        PRINT 'Chilkat HTTP followed the redirect.'

        --  Display the final redirect URL:
        PRINT 'Final URL:'
        EXEC sp_OAGetProperty @http, 'FinalRedirectUrl', @iTmp0 OUT
        PRINT @iTmp0

        --  Note the HTML returned is from the final redirect URL.

      END
    ELSE
      BEGIN
        PRINT 'Not redirected.'
      END

    EXEC sp_OAGetProperty @http, 'LastStatus', @status OUT

    IF @status = 200
      BEGIN
        PRINT 'status = 200, OK!'
      END
    ELSE
      BEGIN
        PRINT 'HTTP Response status = ' + STR(@status)

        --  Display the complete response header.
        EXEC sp_OAGetProperty @http, 'LastResponseHeader', @iTmp0 OUT
        PRINT @iTmp0
      END

    --  Now try it without following redirects:
    PRINT '-------- Now trying without following redirects....'
    EXEC sp_OASetProperty @http, 'FollowRedirects', 0

    --  Send the HTTP GET and return the content in a string.
    EXEC sp_OAMethod @http, 'QuickGetStr', @html OUT, @url
    IF @html Is Nothing 
      BEGIN
        --  the HTML string can NULL if a 302 redirect response is received.
        PRINT 'HTML string returned NULL...'
      END

    --  On success, LastErrorText will provide information about
    --  what happened during the call.
    PRINT '--------------- LastErrorText ------------------'
    EXEC sp_OAGetProperty @http, 'LastErrorText', @iTmp0 OUT
    PRINT @iTmp0
    PRINT '------------------------------------------------'

    --  In this case, we see something like this:
    --  ChilkatLog:
    --    QuickGetHtml:
    --      DllDate: Jul 27 2007
    --      url: http://www.planyourweddingonline.co.za/
    --      StatusCode: 302
    --      StatusText: Found
    --      Reading chunked response
    --      redirectUrl: main/main/home/index.php

    --  Was this a redirect?  Even if FollowRedirects is false,
    --  WasRedirected will be true (non-zero) if the response
    --  indicated a redirect.
    EXEC sp_OAGetProperty @http, 'WasRedirected', @iTmp0 OUT
    IF @iTmp0 = 1
      BEGIN
        PRINT 'This was a redirect response'

        --  When redirects are not followed, FinalRedirectUrl
        --  contains the redirect URL that would've been taken...
        --  Display the redirect URL, which was not taken...
        PRINT 'Redirect URL:'
        EXEC sp_OAGetProperty @http, 'FinalRedirectUrl', @iTmp0 OUT
        PRINT @iTmp0

      END
    ELSE
      BEGIN
        PRINT 'Not redirected.'
      END

    EXEC sp_OAGetProperty @http, 'LastStatus', @status OUT

    IF @status = 200
      BEGIN
        PRINT 'status = 200, OK!'
      END
    ELSE
      BEGIN
        PRINT 'HTTP Response status = ' + STR(@status)

        --  Display the complete response header.
        EXEC sp_OAGetProperty @http, 'LastResponseHeader', @iTmp0 OUT
        PRINT @iTmp0
      END
END
GO