HttpWebRequest request thrown exception in C #, the underlying connection is closed: The connection was closed unexpectedly

When using HttpWebRequest to simulate the request, sometimes because of the server and other aspects of the request to make a limit,
The underlying connection has been closed when the request occurs: An unexpected error occurred while receiving
The general reason for this is because the server does not allow persistent connection connections and HTTP versions to be created with Internet resources
Make the following simple changes HttpWebRequest can be solved

Request. KeepAlive = false;  Setup does not establish a persistent connection connection request. ProtocolVersion = Httpversion.version10; The HTTP version has 2, one is 1.0, the other is 1.1, and the actual test replacement is more practical.

HttpWebRequest request thrown exception in C #, the underlying connection is closed: The connection was closed unexpectedly