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When you build Microsoft Foundation Classes (MFC) ISAPI extensions in Microsoft Visual Studio .NET 2003, an additional line appears at the start of the message body.
Note In a valid HTTP response message, each HTTP header is delimited by "\r\n". The "\r\n" delimiter inserts one new line. The last header is delimited by "\r\n\r\n". The "\r\n\r\n" delimiter inserts two new lines.
This problem occurs because the MFC ISAPI extensions use the WriteClient function to delimit the headers. When you use the WriteClient function, MFC sends another carriage-return line-feed (CRLF) character to delimit the headers from the HTTP message body. This CRLF character causes an additional line to appear at the start of the message body.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio .NET 2003 service pack that contains this hotfix.
To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
You must have Visual Studio .NET 2003 installed before you apply this hotfix.
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
Hotfix 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 tool in Control Panel.
To work around this problem, use the ServerSupport function instead of the WriteClient function. The ServerSupport function is available in the Microsoft Internet Information Services (IIS) software development kit (SDK). The IIS SDK is part of the Microsoft Windows Server 2003 SP1 SDK. For more information, visit the following Microsoft Web site:
Microsoft Visual Studio .NET 2003 Professional Edition, Microsoft Visual Studio .NET 2003 Academic Edition, Microsoft Visual Studio .NET 2003 Enterprise Architect, Microsoft Visual Studio .NET 2003 Enterprise Developer