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Q214539: PRB: Netscape Returns "Data Missing" After Resizing the Browser

Article: Q214539
Product(s): Microsoft Visual Basic for Windows
Version(s): 6.0
Operating System(s): 
Keyword(s): kb3rdparty kberrmsg kbASP kbVBp600 kbWebClasses kbGrpDSASP kbDSupport
Last Modified: 25-APR-2001

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The information in this article applies to:

- Microsoft Visual Basic Learning Edition for Windows, version 6.0 
- Microsoft Visual Basic Professional Edition for Windows, version 6.0 
- Microsoft Visual Basic Enterprise Edition for Windows, version 6.0 
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SYMPTOMS
========

When resizing the Netscape Navigator Web browser on a page generated by a
WebClass, the following error occurs:

  Data Missing
  This document resulted from a POST operation and has expired from the cache.
  If you wish you can repost the form data to recreate the document by pressing
  the reload button.

CAUSE
=====

When the Netscape Navigator Web browser is resized, the browser attempts to
retreive the page from its cache when repainting the window. However, the host
Active Server Page (ASP) page used for instantiating the WebClass sets the
Expiration date and time of the page to expire immediately and the browser will
not cache the page. Also, since the requested page was retrieved as a result of
an HTTP POST (for example, form submission) and the Web browser does not cache
the POSTed data, Netscape Navigator is unable to repaint the page without first
re-posting the data and requesting the page from the server.

RESOLUTION
==========

You need to change the expiration data/time of the page via the Expires HTTP
Header. You can do so by adding the following code to the ASP page generated by
the WebClass, or in a WebItem in your WebClass:

  Response.ExpiresAbsolute = #10/06/2000# 'A future expiration date

NOTE: In general, it is not recommended that you change the ASP page generated by
the WebClass. Also note, you will need to add this code each time you recompile
the WebClass because the ASP page will be overwritten.

The third-party products discussed in this article are manufactured by vendors
independent of Microsoft; we make no warranty, implied or otherwise, regarding
these products' performance or reliability.

Additional query words:

======================================================================
Keywords          : kb3rdparty kberrmsg kbASP kbVBp600 kbWebClasses kbGrpDSASP kbDSupport 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVBA600 kbVB600
Version           : :6.0
Issue type        : kbprb

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