PRB: Doctype Parsing Behavior in Visual InterDev

This article was previously published under Q175324
This article has been archived. It is offered "as is" and will no longer be updated.
The following error occurs when you browse an Active Server Pages (ASP) file:
Response object error 'ASP 0156'

Header Error <your asp file>, line 3 The HTTP headers are already written to the client browser. Any HTTP header modifications must be made before writing page content.
The following conditions cause the error to occur:

  • The ASP file contains a WebBot from FrontPage 97.
  • The ASP file contains a 'response.expires' or 'response.buffer'.
Every time the file is saved in Visual InterDev, the FrontPage ServerExtensions parse the file and add the following line to the top of the file:
NOTE: The local copy does not change, so you must obtain a working copy to see the changes.

With the above line added to the file, the response properties mentionedabove are now set after the HTTP header has been written to the clientbrowser.
Remove the WebBot.


Edit the ASP file in NotePad and remove the "DOCTYPE"line.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Steps to Reproduce Behavior

  1. Create a new .htm file in a Visual InterDev project.
  2. Open the .htm file in Microsoft FrontPage 97 (Visual InterDev edition).
  3. Add the Timestamp bot to the .htm file. Save and close the file.
  4. Rename the .htm file extension to .asp, and open the .asp file in the default editor.
  5. Add the following code to the third line (after <%@ LANGUAGE...) in the file:
  6. Save and preview the file. You receive the above-mentioned error message.
Get a working copy of the file and select Use Master Copy when prompted.

The first line of the file now contains the <doctype...> instead of <%@language =...>
For the latest Knowledge Base articles and other support information onVisual InterDev and Active Server Pages, see the following page on theMicrosoft Technical Support site:

Article ID: 175324 - Last Review: 02/21/2014 00:28:43 - Revision: 3.1

  • Microsoft Visual InterDev 1.0 Standard Edition
  • Microsoft FrontPage 97 Standard Edition
  • kbnosurvey kbarchive kbprb KB175324