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Q250983: Using Netscape Server Push Technology with ASP

Article: Q250983
Product(s): Internet Information Server
Version(s): WINDOWS:5; winnt:4.0,5.0
Operating System(s): 
Keyword(s): kbOSWin2000
Last Modified: 13-MAY-2002

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The information in this article applies to:

- Microsoft Internet Information Services version 5.0 
- Microsoft Internet Explorer (Programming) version 5 
- Microsoft Internet Information Server version 4.0 
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SUMMARY
=======

The Netscape Web browser implements a proprietary technology known as Server
Push to send a type of dynamic page updates to a client. This technology is not
supported by Microsoft Internet Explorer. However, you can use Server Push with
Microsoft Active Server Pages (ASP), or you can Client Pull as an optional
method of displaying dynamic page updates in Internet Explorer.

MORE INFORMATION
================

Microsoft provides programming examples for illustration only, without warranty
either expressed or implied, including, but not limited to, the implied
warranties of merchantability and/or fitness for a particular purpose. This
article assumes that you are familiar with the programming language being
demonstrated and the tools used to create and debug procedures. Microsoft
support professionals can help explain the functionality of a particular
procedure, but they will not modify these examples to provide added
functionality or construct procedures to meet your specific needs. If you have
limited programming experience, you may want to contact a Microsoft Certified
Partner or the Microsoft fee-based consulting line at (800) 936-5200. For more
information about Microsoft Certified Partners, please visit the following
Microsoft Web site:

  http://www.microsoft.com/partner/referral/

For more information about the support options that are available and about how
to contact Microsoft, visit the following Microsoft Web site:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

Server Push Using ASP:

To implement Server Push using ASP, do the following:

1. Save the following code as Push.asp in a folder with at least Script access
  defined:

  <% @Language="VBScript" %>
  <%
    Option Explicit
    Dim strBoundary

    ' change the following string to whatever boundary you wish to use
    strBoundary = "MSBOB"

    ' turn off buffering
    Response.Buffer = False

    ' set the content type as a multipart document
    Response.ContentType = "multipart/x-mixed-replace;boundary=" & strBoundary

    ' create a function to output the boundary
    Sub WriteBoundary()
      Response.Write "--" & strBoundary & vbCrLf
      Response.Write "Content-Type: text/html" & vbCrLf & vbCrLf
    End Sub

    ' this is a very unelegant sleep function just to create a short delay
    Sub Sleep(tmpSeconds)
      Dim dtmOne,dtmTwo
      dtmOne = Now()
      While DateDiff("s",dtmOne,dtmTwo) < tmpSeconds
        dtmTwo = Now()
      Wend
    End Sub
  %>
  <% WriteBoundary %>
  <html>
  <body>
  <p>First Page</p>
  </body>
  </html>
  <%
    Sleep 10
    WriteBoundary
  %>
  <html>
  <body>
  <p>Second Page</p>
  </body>
  </html>
  <%
    Sleep 10
    WriteBoundary
  %>
  <html>
  <body>
  <p>Third Page</p>
  </body>
  </html>

2. Browse to the page using the Netscape Web browser. The following behavior
  should occur:

   - The first page displays for 10 seconds, and the browser indicates that it
     is still loading a document.

   - The second page displays for 10 seconds, and the browser continues to
     indicate that it is still loading a document.

   - The third page displays, and the browser indicates that the document
     loading has completed.

For more information on Server Push, Client Pull, and Microsoft's Internet
products, please see the following articles:

  Q159650 - Server Push Animation Not Supported in Internet Explorer

  Q194083 - FP98: How to Use Client Pull in FrontPage Web Documents

  Q196471 - FP2000: How to Use Client Pull in FrontPage Web Documents

  Q240774 - How to Enable Client Pull for Web Servers, Sites, and Folders

  An Exploration Of Dynamic Documents

The third-party contact information included in this article is provided to help
you find the technical support you need. This contact information is subject to
change without notice. Microsoft in no way guarantees the accuracy of this
third-party contact information.

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          : kbOSWin2000 
Technology        : kbiisSearch kbIEsearch kbAudDeveloper kbSDKIESearch kbiis500 kbiis400 kbZNotKeyword kbSDKIE500
Version           : WINDOWS:5; winnt:4.0,5.0
Issue type        : kbhowto
Solution Type     : kbpending

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