如何設置HttpWebResponse的內容長度限制

Question

我用的時候：

   response = (HttpWebResponse)req.GetResponse();

它將響應來自網頁的整個HTML的包內容。 但我只想得到網頁的標題。 我可以設置響應內容長度的限制嗎？

謝謝！

Answer 1

如果您只需要HTTP標頭 - 請使用HEAD請求而不是GET。 如果您需要網頁的某些部分，則可能更容易閱讀整個響應，除非您知道它需要哪個部分。 您可以讀取部分響應流或使用范圍 - HttpWebRequest.AddRange 。

Answer 2

使用響應對象上的Headers屬性。 在你開始閱讀它之前，只是調用GetResponse()並不會GetResponse()整個事情。

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

從以上網站獲取的代碼：

            // 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

我認為此頁面上的示例涵蓋了您的需求。

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();