使用HttpWebRequest，Keep-alive不适用于对localhost的许多类似请求 [英] Using HttpWebRequest, Keep-alive not working for many similar requests to localhost

问题描述

我正在使用 HttpWebRequest 向localhost上的相同HTTP网址发送许多同步请求，而我需要重新使用TCP连接以防止短暂的端口耗尽。

但我似乎无法使Keep-alive正常工作。

这是我发出HTTP请求的代码：

  var request =（HttpWebRequest）WebRequest .Create（URL）; 
 HttpWebResponse response = null; 
 
 request.Method =GET; 
 request.KeepAlive = true; 
 
尝试
 {
 response =（HttpWebResponse）request.GetResponse（）; 
 // ... ... 
} 
 catch（例外e）
 {
 // ... 
} 
最后
 {
 if（response！= null）
 {
 response.Close（）; 
} 
} 
  

我在循环中多次调用上面的代码。所有请求都成功，并返回OK状态代码（200），但运行 netstat -ano 显示 TIME_WAIT中有多个很多连接 state，我希望它可以重新使用单个连接。

我尝试在localhost上调用两个IIS Express服务器（默认ASP.NET MVC）应用程序）和WebLogic应用程序，结果相同。

我还尝试从.NET 4.5中 HttpClient 。 / p>

这很快就会导致短暂的端口耗尽。

我正在做什么有什么问题？如何让.NET重用TCP连接？

解决方案

尝试response.Dispose（）;而不是response.Close（）;

I'm using HttpWebRequest to send many sync requests to the same HTTP URL on localhost, and I need to re-use TCP connections to prevent ephemeral port depletion.

But I don't seem to be able to get Keep-alive working.

Here's my code where I make the HTTP request:

var request = (HttpWebRequest) WebRequest.Create(url);
HttpWebResponse response = null;

request.Method = "GET";
request.KeepAlive = true;

try
{
    response = (HttpWebResponse) request.GetResponse();
    // ...
}
catch (Exception e)
{
    // ...
}
finally
{
    if (response != null)
    {
        response.Close();
    }
}

I call the above code many times in a loop. All requests are successful, and return OK status code (200), but running netstat -ano reveals that there are MANY MANY connections in the TIME_WAIT state, where I expect it to re-use a single connection.

I tried calling both an IIS Express server on localhost (default ASP.NET MVC application) and a WebLogic application, with the same result.

I also tried HttpClient from .NET 4.5.

This quickly results in running out of ephemeral ports.

Is there anything wrong with what I'm doing? How can I make .NET re-use TCP connections?

解决方案

Try response.Dispose(); instead of response.Close();

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