使用 HttpWebRequest 时保持会话

Question

在我的项目中，我使用 C# 应用程序客户端和 tomcat6 Web 应用程序服务器。 我在 C# 客户端写了这个 sn-p：

public bool isServerOnline()
{
        Boolean ret = false;

        try
        {
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(VPMacro.MacroUploader.SERVER_URL);
            req.Method = "HEAD";
            req.KeepAlive = false;
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            if (resp.StatusCode == HttpStatusCode.OK)
            {
                // HTTP = 200 - Internet connection available, server online
                ret = true;
            }
            resp.Close();
            return ret;

        }
        catch (WebException we)
        {
            // Exception - connection not available
            Log.e("InternetUtils - isServerOnline - " + we.Status);
            return false;
        }
}

每次调用此方法时，我都会在服务器端获得一个新会话。 我想这是因为我应该在我的客户端中使用 HTTP cookie。但我不知道该怎么做，你能帮帮我吗？

Answer 1

您必须使用 CookieContainer 并在调用之间保留实例。

private CookieContainer cookieContainer = new CookieContainer();
public bool isServerOnline()
{
        Boolean ret = false;

        try
        {
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(VPMacro.MacroUploader.SERVER_URL);
            req.CookieContainer = cookieContainer; // <= HERE
            req.Method = "HEAD";
            req.KeepAlive = false;
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            if (resp.StatusCode == HttpStatusCode.OK)
            {
                // HTTP = 200 - Internet connection available, server online
                ret = true;
            }
            resp.Close();
            return ret;

        }
        catch (WebException we)
        {
            // Exception - connection not available
            Log.e("InternetUtils - isServerOnline - " + we.Status);
            return false;
        }
}