HTTP request with post

Question

Hello. How can I make http request and send some data via post? I can do "get" request but have no idea how to make "post" one.

C#

Answer 1

You need to use the WebRequest class and the GetRequestStream method.

Here is an example.

Answer 2

MSDN has a sample.

using System;
using System.IO;
using System.Net;
using System.Text;

namespace Examples.System.Net
{
    public class WebRequestPostExample
    {
        public static void Main ()
        {
            // Create a request using a URL that can receive a post. 
            WebRequest request = WebRequest.Create ("http://www.contoso.com/PostAccepter.aspx ");
            // Set the Method property of the request to POST.
            request.Method = "POST";
            // Create POST data and convert it to a byte array.
            string postData = "This is a test that posts this string to a Web server.";
            byte[] byteArray = Encoding.UTF8.GetBytes (postData);
            // Set the ContentType property of the WebRequest.
            request.ContentType = "application/x-www-form-urlencoded";
            // Set the ContentLength property of the WebRequest.
            request.ContentLength = byteArray.Length;
            // Get the request stream.
            Stream dataStream = request.GetRequestStream ();
            // Write the data to the request stream.
            dataStream.Write (byteArray, 0, byteArray.Length);
            // Close the Stream object.
            dataStream.Close ();
            // Get the response.
            WebResponse response = request.GetResponse ();
            // Display the status.
            Console.WriteLine (((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.
            dataStream = response.GetResponseStream ();
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader (dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd ();
            // Display the content.
            Console.WriteLine (responseFromServer);
            // Clean up the streams.
            reader.Close ();
            dataStream.Close ();
            response.Close ();
        }
    }
}

Answer 3

This should help:

HttpWebRequest HttpWReq =
(HttpWebRequest)WebRequest.Create("http:\\domain.com\page.asp");

ASCIIEncoding encoding=new ASCIIEncoding();
string postData="username=user";
postData += ( "&password=pass");
byte[] data = encoding.GetBytes(postData);

HttpWReq.Method = "POST";
HttpWReq.ContentType = "application/x-www-form-urlencoded";
HttpWReq.ContentLength = data.Length;

Stream newStream = HttpWReq.GetRequestStream();
newStream.Write(data,0,data.Length);
newStream.Close();