C＃发布请求未标识为会话

Question

我一直在尝试让WPF客户端连接到PHP服务器，自行登录并获取“ IsLogged.php”以验证客户端已登录。但是，“ IsLogged.php”始终返回客户端未登录的信息。身份验证，我在做什么错？

服务器代码：

“ CreateAccount.php”

session_start();

if (isset($_POST['user']))
{
    $_SESSION['UserName'] = $_POST['user'];
    echo "check";
}

“ IsLogged.php”

session_start();

if (isset($_SESSION['UserName']))
{
    echo "allowed";
}
else
{
    echo "not allowed";
}

客户代码：

“发布”方法

    public static string Post(string RequestName, string PostData, out HttpStatusCode ReturnCode)
    {
        byte[] byteArray = Encoding.UTF8.GetBytes(PostData);

        WebRequest Request = WebRequest.Create(ChatAPI.Settings.BaseUrl + RequestName);
        Request.Method = "POST";
        Request.ContentType = "application/x-www-form-urlencoded";
        Request.ContentLength = byteArray.Length;

        Stream dataStream = Request.GetRequestStream();
        dataStream.Write(byteArray, 0, byteArray.Length);
        dataStream.Close();

        WebResponse response = Request.GetResponse();
        dataStream = response.GetResponseStream();

        ReturnCode = ((HttpWebResponse)response).StatusCode;

        StreamReader reader = new StreamReader(dataStream);
        string returnedData = reader.ReadToEnd();

        reader.Close();
        dataStream.Close();
        response.Close();

        return returnedData;
    }

最后，窗口触发POST请求。

        HttpStatusCode Code;
        MessageBox.Show(General.Post("IsLogged", "", out Code)); --> Not allowed (intended)
        MessageBox.Show(General.Post("CreateAccount", "user=jan", out Code)); --> check (intended)
        MessageBox.Show(General.Post("IsLogged", "", out Code)); --> Not allowed (should be allowed)

服务器为什么不将请求注册为会话？

Answer 1

服务器识别客户端的方式（以及相应的会话状态）是通过cookie。

基本上，在CreateAccount请求中，服务器将cookie附加到其响应中，并希望客户端在每个后续请求中都显示cookie。

如果请求中不存在Cookie，则服务器将无法识别客户端并将请求视为来自未知源。

您的代码根本不管理cookie，因此这就是C＃客户端始终看起来是PHP服务器的新客户端的原因。

保存从服务器接收的cookie并将其显示在每个新请求中的最简单方法是使用CookieContainer的实例， 并将其附加到您提出的每个请求上 。

我没有尝试过这段代码，所以我不确定语法的百分百，但这是一个起点：

// this instance will be reused across multiple requests
private static CookieContainer cookieContainer = new CookieContainer();

public static string Post(string RequestName, string PostData, out HttpStatusCode ReturnCode)
{
    byte[] byteArray = Encoding.UTF8.GetBytes(PostData);

    WebRequest Request = WebRequest.Create(ChatAPI.Settings.BaseUrl + RequestName);
    Request.Method = "POST";
    Request.ContentType = "application/x-www-form-urlencoded";
    Request.ContentLength = byteArray.Length;

    Request.CookieContainer = cookieContainer; // this line is new

    Stream dataStream = Request.GetRequestStream();
    dataStream.Write(byteArray, 0, byteArray.Length);
    dataStream.Close();

    WebResponse response = Request.GetResponse();
    dataStream = response.GetResponseStream();

    ReturnCode = ((HttpWebResponse)response).StatusCode;

    StreamReader reader = new StreamReader(dataStream);
    string returnedData = reader.ReadToEnd();

    reader.Close();
    dataStream.Close();
    response.Close();

    return returnedData;
}