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Article ID: 904262 - Last Review: May 21, 2007 - Revision: 1.5
The request that is sent by the HttpWebRequest class may stop responding when you use the HttpWebRequest class in an ASP.NET application
When you use the
HttpWebRequest class in a Microsoft ASP.NET application, the request that is sent by the
HttpWebRequest class may stop responding.
This behavior may occur when the
HttpWebRequest class and the
HttpWebResponse class are used to make a HTTP or HTTPS request from an ASP.NET page and the ASP.NET page times out before the request is finished. When the ASP.NET page times out, the request is aborted. The aborted request may leave the connection that was initiated by the
HttpWebRequest class in an unknown state and may cause the request to fail.
Note Managed code classes such as SOAP and remoting internally use the
HttpWebRequest class. Therefore, managed code classes may exhibit the same behavior.
To work around this behavior, you must make sure that the ASP.NET time-out value is large enough to handle sending the request with the
HttpWebRequest.GetResponse method and reading the response stream that is retrieved by using the
HttpWebResponse class.
Note The HTTP request is made up of the following parts:
- Sending the request is covered by using the HttpWebRequest.Timeout method.
- Getting the response header is covered by using the HttpWebRequest.Timeout method.
- Reading the body of the response is not covered by using the HttpWebResponse.Timeout method. In ASP.NET 1.1 and in later versions, reading the body of the response is covered by using the HttpWebRequest.ReadWriteTimeout method. The HttpWebRequest.ReadWriteTimeout method is used to handle cases where the response headers are retrieved in a timely manner but where the reading of the response body times out.
You set the ASP.NET time-out value in the web.config file or in the machine.config file that uses the
executionTimeout property in the
<httpRuntime> section.
Note If the
debug property in the .config file is set to
true, the
executionTimeout property is ignored.
You must set the ASP.NET
executionTimeout setting to a value that is larger than or equal to the value that is determined by the following formula:
(HttpWebRequest.Timeout * 2) + HttpWebRequest.ReadWriteTimeout
This behavior is by design.
For more information, see the following Microsoft Developer Network (MSDN) Web sites:
APPLIES TO
- Microsoft ASP.NET 1.1
- Microsoft ASP.NET 1.0
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