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Editorial Team
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Asked: 2026-06-08T02:00:53+00:00

i am trying to write out a response to the client: response.StatusCode = (int)HttpStatusCode.BadRequest;

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i am trying to write out a response to the client:

response.StatusCode = (int)HttpStatusCode.BadRequest;
response.ClearContent();
response.Write(String.Format(
      "<!doctype html>"+CRLF+
      "<html>" + CRLF +
      "<head><title>{0}</title></head>" + CRLF +
      "<body><h1>{0}</h1>"+CRLF+
      "{1}"+CRLF+
      "</body>" + CRLF +
      "</html>", 
      response.Status, "The grob must be in the frobber."));
response.Flush();
response.End();

The code works fine when running on the localhost (Visual Studio (2010 (Windows 7 (Professional (64-bit))))) development Cassini web-server:

HTTP/1.1 400 Bad Request
Server: ASP.NET Development Server/10.0.0.0
Date: Tue, 17 Jul 2012 15:56:42 GMT
X-AspNet-Version: 4.0.30319
Cache-Control: private
Content-Type: text/html
Connection: Close

<!doctype html>
<html>
<head><title>400 Bad Request</title></head>
<body><h1>400 Bad Request</h1>
The grob must be in the frobber.
</body>
</html>

But when i deploy the web-site to Windows Server 2008 R2 running IIS7.5, the same code doesn’t work:

HTTP/1.1 400 Bad Request
Cache-Control: private
Content-Type: text/html
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Tue, 17 Jul 2012 15:57:44 GMT
Content-Length: 11

Bad Request

How do i perform Response.Write from IIS?

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1 Answer

  1. Editorial Team

    By default, IIS 7 will change the response if the code is >= 400
    http://msdn.microsoft.com/en-us/library/ms690497(v=vs.90).aspx

    But you can change this in the httpErrors element of system.webServer.

    <httpErrors existingResponse="PassThrough" />

    EDIT: this will break CustomErrors, if you are using that. You might be better off returning a 400 without a response, then setting up web.config to redirect to a custom page for 400 errors.

    <customErrors mode="On">
    <error statusCode="400" redirect="Frobber.htm" />
</customErrors>
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