在.net中如何创建一个HTTP请求手动？

问题描述

我想创建自己的自定义HTTP请求。 WebClient类是非常酷，但它会自动创建HTTP请求。我想我需要创建一个网络连接到Web服务器，并通过该流通过我的数据，但我不熟悉，将支持这种事情的库类。

I'd like to create my own custom HTTP requests. The WebClient class is very cool, but it creates the HTTP requests automatically. I'm thinking I need to create a network connection to the web server and pass my data over that stream, but I'm unfamiliar with the library classes that would support that kind of thing.

（背景下，我工作的一些$ C $下，我要教一个网络编程类。我希望我的学生了解发生了什么内部HTTP的黑盒子的基础知识。）

(Context, I'm working on some code for a web programming class that I'm teaching. I want my students to understand the basics of what's happening inside the "black box" of HTTP.)

推荐答案

要真正理解HTTP协议的，你可以使用内部的类：

To really understand the internals of the HTTP protocol you could use TcpClient class:

using (var client = new TcpClient("www.google.com", 80))
{
    using (var stream = client.GetStream())
    using (var writer = new StreamWriter(stream))
    using (var reader = new StreamReader(stream))
    {
        writer.AutoFlush = true;
        // Send request headers
        writer.WriteLine("GET / HTTP/1.1");
        writer.WriteLine("Host: www.google.com:80");
        writer.WriteLine("Connection: close");
        writer.WriteLine();
        writer.WriteLine();

        // Read the response from server
        Console.WriteLine(reader.ReadToEnd());
    }
}

另一种可能性是激活跟踪通过把下面的内容的app.config 键，只需使用 Web客户端以执行一个HTTP请求：

Another possibility is to activate tracing by putting the following into your app.config and just use WebClient to perform an HTTP request:

<configuration>
  <system.diagnostics>
    <sources>
      <source name="System.Net" tracemode="protocolonly">
        <listeners>
          <add name="System.Net"/>
        </listeners>
      </source>
    </sources>
    <switches>
      <add name="System.Net" value="Verbose"/>
    </switches>
    <sharedListeners>
      <add name="System.Net"
           type="System.Diagnostics.TextWriterTraceListener"
           initializeData="network.log" />
    </sharedListeners>
    <trace autoflush="true"/>
  </system.diagnostics>
</configuration>

然后就可以执行HTTP调用：

Then you can perform an HTTP call:

using (var client = new WebClient())
{
    var result = client.DownloadString("http://www.google.com");
}

最后分析了产生的 network.log 文件中的网络流量。 Web客户端也将遵循HTTP重定向。

And finally analyze the network traffic in the generated network.log file. WebClient will also follow HTTP redirects.

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