Question

当我使用时：

   response = (HttpWebResponse)req.GetResponse();

它将从网页回复整个HTML的包内容。但我只想得到网页的标题。我可以为响应内容长度设置限制吗？

谢谢！

Answer 1

如果您只需要HTTP标头 - 请使用HEAD请求而不是GET。如果您需要网页的某些部分，则可能更容易阅读整个响应，除非您知道它需要哪个部分。您可以阅读部分响应流或使用范围 - HttpWebRequest.AddRange。

Answer 2

在响应对象上使用Headers属性。在你开始阅读之前，只是打电话给GetResponse()并没有完全了解它。

http://msdn.microsoft.com/en-us/library/system.net.httpwebresponse.headers.aspx

从上述网站获取的代码：

            // Creates an HttpWebRequest for the specified URL. 
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url); 
            // Sends the HttpWebRequest and waits for response.
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse(); 

            // Displays all the headers present in the response received from the URI.
            Console.WriteLine("\r\nThe following headers were received in the response:");
            // Displays each header and it's key associated with the response.
            for(int i=0; i < myHttpWebResponse.Headers.Count; ++i)  
                Console.WriteLine("\nHeader Name:{0}, Value :{1}",myHttpWebResponse.Headers.Keys[i],myHttpWebResponse.Headers[i]); 
            // Releases the resources of the response.
            myHttpWebResponse.Close();

Answer 3

我认为this page上的示例涵盖了您的需求。

示例：

// Creates an HttpWebRequest for the specified URL. 
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url); 

// Sends the HttpWebRequest and waits for response.
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse(); 

// Displays all the headers present in the response received from the URI.
Console.WriteLine("\r\nThe following headers were received in the response:");

// Displays each header and it's key associated with the response.
for(int i=0; i < myHttpWebResponse.Headers.Count; ++i)  
Console.WriteLine("\nHeader Name:{0}, Value :{1}",myHttpWebResponse.Headers.Keys[i],myHttpWebResponse.Headers[i]); 

// Releases the resources of the response.
myHttpWebResponse.Close();

如何设置HttpWebResponse的内容长度限制

3 个答案: