Microsoft KB Archive/932385

= FIX: CGI applications that set multiple instances of a response header in IIS 7.0 do not work as expected =

Article ID: 932385

Article Last Modified on 9/25/2007

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APPLIES TO

 Microsoft Internet Information Services 7.0, when used with:  Windows Vista Ultimate

 Windows Vista Home Premium

 Windows Vista Home Basic

 Windows Vista Enterprise</li></ul>

 Windows Vista Business</li></ul>

 Windows Vista Business 64-bit edition</li></ul>

 Windows Vista Ultimate 64-bit edition</li></ul>

 Windows Vista Home Premium 64-bit edition</li></ul>

 Windows Vista Home Basic 64-bit edition</li></ul>

 Windows Vista Enterprise 64-bit edition</li></ul> </li></ul>

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<div class="symptoms_section">

SYMPTOMS
Consider the following scenario:
 * You host a Common Gateway Interface (CGI) application on an Internet Information Services (IIS) 7.0 Web server.
 * After the CGI application processes a request, the CGI application sets multiple instances of a response header as part of its response.

In this scenario, only the last instance of the response header is sent to the client.

For example, the CGI application sets multiple &quot;Set-cookie&quot; response headers. However, the client receives only the last cookie value.

<div class="cause_section">

CAUSE
In IIS 7.0, multiple value instances of the same response header are not appended. Instead, all instances are replaced by the last value only.

<div class="resolution_section">

Update information
To resolve this problem, apply the update for the operating system that you have. For more information about this update, visit the following Microsoft Download Center Web sites:  Windows Vista, 64-bit versions

http://www.microsoft.com/downloads/details.aspx?FamilyId=3B837AB4-4E0C-4E0A-B5A3-9ECEFD0E02DA

</li> Windows Vista, all other versions

http://www.microsoft.com/downloads/details.aspx?FamilyId=9DBA1A94-1885-4038-AF1D-A1E51D6EC8F8

</li></ul>

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
No prerequisites are required.

Restart requirement
You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, 64-bit versions
<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

<div class="moreinformation_section">

MORE INFORMATION
This behavior can affect any CGI application that sets multiple instances of the same response header. One known example is Microsoft Virtual Server. If you host a Virtual Server Administration Web application on IIS 7.0, and you use the Virtual Server Administration Web application to change the Web site properties, the changes are not saved as expected. This occurs because personal settings of the Virtual Server Administration Web application are stored in the form of cookies. If the Virtual Server Administration Web application is hosted in IIS 7.0, and the application runs on a Windows Vista-based computer, only the last cookie that is set is saved.

Non-Microsoft CGI applications can also be affected. Microsoft has been notified that the Movable Type publishing platform application is affected by this problem.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Additional query words: iis7 cgi only last cookies set

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbexpertisebeginner kbhotfixserver kbwinvistapostrtmfix KB932385

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