如何维护httpwebrequest的状态 [英] how to maintain the state of the httpwebrequest

问题描述

嗨 我已经使用以下代码进行了身份验证，并且现在使用此身份验证成功实现了它，我还必须继续从url"http://localhost:8080/geonetwork/srv/en/xml.metadata.get"获取响应
这是我用来获取身份验证的代码

 受保护的 无效 Page_Load(对象发​​件人，EventArgs e)
    {
        字符串 RequestXML = "  +
                            "  +
                            " ;
        字符串 ServerURL = " ;
        字符串 ResponseXML = postRequest(RequestXML，ServerURL);
        Label1.Text = ResponseXML;
    }
 
    私有 字符串 postRequest(字符串 RequestXML，字符串 ServerURL)
    {
         int 超时=  90000 ;
         int  connectionLimit =  10 ;
        字符串 responseXML = 字符串 .Empty;
        尝试
        {
            HttpWebRequest webRequest =(HttpWebRequest)WebRequest.Create(ServerURL);
            webRequest.Timeout =超时;
            webRequest.KeepAlive =  true ;
            webRequest.ServicePoint.ConnectionLimit = connectionLimit;
            webRequest.Method = " ;
            webRequest.ContentType = " ;
            字节 [] byteArray = Encoding.UTF8.GetBytes(RequestXML);
            流strm = webRequest.GetRequestStream();
            strm.Write(byteArray， 0 ，byteArray.Length);
            strm.Close();
            HttpWebResponse webResponse =(HttpWebResponse)webRequest.GetResponse();
            编码enc = Encoding.GetEncoding(" );
            StreamReader reader = 新 StreamReader(webResponse.GetResponseStream()，enc);
            responseXML = reader.ReadToEnd();
            reader.Close();
            webResponse.Close();
        }
        捕获(例外)
        {
            扔(例如)；
        }
        返回 responseXML;
    } 

使用上面的代码，我必须从该URL"http://localhost:8080/geonetwork/srv/en/xml.metadata.get"中获取响应，而不会丢失身份验证，请pl帮助我做到这一点
.

解决方案

如 RaisKazi [ ^ ]已经写过在对您的问题的评论中，HTTP本身是无状态的.您想要的任何状态都必须由服务器应用程序实现.客户端可以传递一个cooky或在先前的响应中传递回该cooky的东西，以向服务器标识自己.为了进行身份验证，我建议您使用NetworkCredentials并让该服务侦听HTTPS上的请求.

干杯！

—MRB

hi i have used the following code to get authenticated and i successfully achieved it now using this authentication i have to futher proceed to get response from the url"http://localhost:8080/geonetwork/srv/en/xml.metadata.get"
this is the code i have used to get authentication

protected void Page_Load(object sender, EventArgs e) 
    { 
        string RequestXML = "<request>" + 
                            "<username>admin</username>" + 
                            "<password>admin</password></request>"; 
        string ServerURL = "http://localhost:8080/geonetwork/srv/en/xml.user.login"; 
        string ResponseXML = postRequest(RequestXML, ServerURL); 
        Label1.Text = ResponseXML; 
    } 
 
    private string postRequest(String RequestXML, string ServerURL) 
    { 
        int timeout = 90000; 
        int connectionLimit = 10; 
        string responseXML = string.Empty; 
        try 
        { 
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(ServerURL); 
            webRequest.Timeout = timeout; 
            webRequest.KeepAlive = true; 
            webRequest.ServicePoint.ConnectionLimit = connectionLimit; 
            webRequest.Method = "POST"; 
            webRequest.ContentType = "text/xml"; 
            byte[] byteArray = Encoding.UTF8.GetBytes(RequestXML); 
            Stream strm = webRequest.GetRequestStream(); 
            strm.Write(byteArray, 0, byteArray.Length); 
            strm.Close(); 
            HttpWebResponse webResponse =(HttpWebResponse)webRequest.GetResponse(); 
            Encoding enc = Encoding.GetEncoding("utf-8"); 
            StreamReader reader = new StreamReader(webResponse.GetResponseStream(),enc); 
            responseXML = reader.ReadToEnd(); 
            reader.Close(); 
            webResponse.Close(); 
        } 
        catch (Exception ex) 
        { 
            throw (ex); 
        } 
        return responseXML; 
    }

using the above code i have to get the response from this url "http://localhost:8080/geonetwork/srv/en/xml.metadata.get" without losing the authentication pl help me in doing this
.

解决方案

As RaisKazi[^] already wrote in a comment to your question, HTTP is per se stateless. Any state you would want would have to be implemented by your server application. A client could pass along a cooky or something that was passed back to it in a previous response to identify themselves to the server. For authentication purposes I''d advise you to use NetworkCredentials and have the service listen to requests over HTTPS.

Cheers!

—MRB

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