HttpWebRequest 注意

使用HttpWebRequest 一定要保证GetRequestStream和GetResponse对象关闭，否则容易造成连接处于CLOSE_WAIT状态

using (Stream stream = webReq.GetRequestStream())

{

stream.Write(buffer, , buffer.Length);

}

HttpWebResponse response = null;

try

{

response = webReq.GetResponse() as HttpWebResponse;

}

finally

{

try

{

if (response != null)

response.Close();

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