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The SetProxy method sets the proxy server for an HTTP request. When you create an application that uses the WinHttpRequest object, if you call the Open method before you call the SetProxy method, your application may leak two event handles every time that the application makes an HTTP request.
A supported hotfix is 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.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
The English version of this hotfix has the file attributes (or later) 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.
Date Time Version Size File name ------------------------------------------------------- 23-Feb-2004 22:19 5.1.2600.1349 313,344 Winhttp.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
To verify that your application has a handle leak, monitor the Handle count in Microsoft Windows Task Manager. In Task Manager, verify that the application is leaking two handles every time that your application makes a new request. Also, verify that the handles are not released for a long time.