Multiple Webrequest in Same Session

Multiple WebRequest in same session

Sessions generally work by using cookies. If you want all your requests to be part of the same session, you need to persist the cookies between requests. You do this by creating a CookieContainer and providing it to each of the HttpWebRequest objects.

Here's your code updated to use a CookieContainer:

    void SaveUrl(string sourceURL, string savepath) {
        CookieContainer cookies = new CookieContainer();
        HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(sourceURL);
        webRequest.CookieContainer = cookies;

        HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();
        StreamReader responseReader = new StreamReader(response.GetResponseStream());

        string sResponseHTML = responseReader.ReadToEnd();
        using (StreamWriter sw = new StreamWriter(savepath, false)) {
            sw.Write(sResponseHTML);
        }

        string[] ImageUrl = GetImgLinks(sResponseHTML);
        foreach (string imagelink in ImageUrl) {
            HttpWebRequest imgRequest = (HttpWebRequest)WebRequest.Create(imagelink);
            imgRequest.CookieContainer = cookies;
            HttpWebResponse imgresponse = (HttpWebResponse)imgRequest.GetResponse();
            //Code to save image
        }
    }

multiple post requests same session c#

You need to store request.CookieContainer in local variable and every time you need to send new request set it again

private CookieContainer cookieContainer;

private void SendRequest()
{
    HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
    request.ContentType = "application/x-www-form-urlencoded";
    request.Method = "POST";

    if (this.cookieContainer != null)                
        request.CookieContainer = this.cookieContainer;                
    else                
        request.CookieContainer = new CookieContainer();                
    ...
    ...
    ...

    this.cookieContainer = request.CookieContainer;
}

And add & to end of postData lines

C# Multiple http requests same PHP session

If you modify your code to match

 private CookieContainer cookieContainer;

        private void Form1_Load(object sender, EventArgs e)
        {

            var wr = (HttpWebRequest)WebRequest.Create("http://localhost/proj/guess-my-fav/1.jpg");
            cookieContainer = new CookieContainer();
            wr.CookieContainer = this.cookieContainer;
            var resp = (HttpWebResponse)wr.GetResponse();
            wr.CookieContainer = cookieContainer;
            using (var s = resp.GetResponseStream())
            {
                pictureBox1.Image = new Bitmap(s);
            }
        }

private void button1_Click(object sender, EventArgs e)
    {
        Uri uri = new Uri("http://localhost/proj/guess-my-fav/level14.php");
        var answer = textBox1.Text;
        string data = "guess=" + answer + "&level=14&time=opt";
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
        request.Method = WebRequestMethods.Http.Post;
        request.CookieContainer = cookieContainer;
        request.KeepAlive = true;
        request.ContentLength = data.Length;
        request.ContentType = "application/x-www-form-urlencoded";
        StreamWriter writer = new StreamWriter(request.GetRequestStream());
        writer.Write(data);
        writer.Close();
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        StreamReader reader = new StreamReader(response.GetResponseStream());
        string tmp = reader.ReadToEnd();
        response.Close();
        richTextBox1.AppendText(tmp); // log - delete this line          
    }

This should make both requests to the server using the same session.

Hope this helps.

Keeping a session when using HttpWebRequest

You must use a CookieContainer and keep the instance between calls.

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;
        }
}

---

Related Topics