解析C#网络编程中的Http请求

解析C#网络编程中的Http请求可以分为以下几个步骤：

1. 构造HttpWebRequest对象

在C#网络编程中，我们使用HttpWebRequest对象来发起一次HTTP请求。构造HttpWebRequest对象需要指定请求的URL、请求方法等参数。下面是一个构造HttpWebRequest对象的示例代码：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.example.com");

其中，"http://www.example.com"是请求的URL。我们可以通过设置HttpWebRequest的属性来指定请求方法、请求头、代理服务器等参数，例如：

request.Method = "POST";
request.ContentType = "application/json";
request.Proxy = new WebProxy("http://proxy.example.com");

2. 发送Http请求并获取响应

构造完HttpWebRequest对象后，我们可以通过调用request.GetResponse()方法来发送HTTP请求，并获取服务器响应。下面是一个发送Http请求并获取响应的示例代码：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.example.com");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

其中，HttpWebResponse对象包含了服务器响应的状态码、响应头、响应正文等信息。我们可以通过调用response.StatusCode、response.Headers、response.GetResponseStream()等属性或方法来获取这些信息。例如：

Console.WriteLine("Status Code: " + response.StatusCode);
Console.WriteLine("Response Headers: ");
foreach (string key in response.Headers.Keys)
{
    Console.WriteLine(key + ": " + response.Headers[key]);
}
StreamReader reader = new StreamReader(response.GetResponseStream());
Console.WriteLine("Response Body: ");
Console.WriteLine(reader.ReadToEnd());

示例说明

1. 发送GET请求，获取网页内容

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.example.com");
request.Method = "GET";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string html = reader.ReadToEnd();
Console.WriteLine(html);

1. 发送POST请求，传输json数据

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.example.com");
request.Method = "POST";
request.ContentType = "application/json";
string postData = "{\"name\": \"Alice\", \"age\": 18}";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string result = reader.ReadToEnd();
Console.WriteLine(result);