Send http request to server without expecting a response

Question

I have a need to send a POST http request to a server ,but it should not expect a response. What method should i use for it ?

I have been using

 WebRequest request2 = WebRequest.Create("http://local.ape-project.org:6969");
 request2.Method = "POST";
 String sendcmd = "[{\"cmd\":\"SEND\",\"chl\":3,\"params\":{\"msg\":\"Helloworld!\",\"pipe\":\"" + sub1 + "\"},\"sessid\":\"" + sub + "\"}]";
 byte[] byteArray2 = Encoding.UTF8.GetBytes(sendcmd);
 Stream dataStream2 = request2.GetRequestStream();
 dataStream2.Write(byteArray2, 0, byteArray2.Length);
 dataStream2.Close();
 WebResponse response2 = request2.GetResponse();

to send a request and get back a response. This works fine if the request will get a response back from the server. But, for my need, i just need to send a POST request. And there will be no response associated with the request i am sending. How do i do it ?

If i use the request2.GetRespnse() command , i get an error that "The connection was closed unexpectedly"

Any help will be appreciated. thanks

score 12 · Answer 1 · answered Jul 11 '11 at 04:03

12

If you're using the HTTP protocol, there has to be a response.

However, it doesn't need to be a very big response:

HTTP/1.1 200 OK
Date: insert date here
Content-Length: 0
\r\n

answered Jul 11 '11 at 04:03

Mike Caron

14,351
4
49
77

1

Hi, is there a way i can just send a request and not get response at all. In my case, the GetResponse() method sends a request and waits for the response. I dont want the second part. I just need to send the request. – CuriousCoder Jul 11 '11 at 04:06
7

Read my answer. HTTP requires a response. Period. If you don't want it, don't use HTTP, implement your own protocol. – Mike Caron Jul 11 '11 at 04:08
1

@MikeCaron so server must send a response, OP doesn't have to care. – Menasheh Jun 21 '18 at 22:45

score 3 · Answer 2 · edited May 23 '17 at 12:32

3

refer to this answer.

What you are looking for, I think, is the Fire and Forget pattern.

edited May 23 '17 at 12:32

Community

1
1

answered Jul 11 '11 at 04:13

sTodorov

5,435
5
35
55

score 2 · Answer 3 · edited Jul 11 '11 at 05:57

2

HTTP requires response as already mentioned by Mike Caron. But as a quick (dirty) fix you could catch the "connnection closed unexpectedly" error and continue.

edited Jul 11 '11 at 05:57

svick

236,525
50
385
514

answered Jul 11 '11 at 05:35

bala

56
1

score 1 · Answer 4 · answered Jul 11 '11 at 06:10

1

If your server is OK with this, you can always use RAW socket to send request then close it.

answered Jul 11 '11 at 06:10

Daniel Mošmondor

19,718
12
58
99

score 0 · Answer 5 · answered Oct 18 '13 at 12:22

Take a look at this it may help.

public static void SetRequest(string mXml)
{
    HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.CreateHttp("http://dork.com/service");
    webRequest.Method = "POST";
    webRequest.Headers["SOURCE"] = "WinApp";

    // Decide your encoding here

    //webRequest.ContentType = "application/x-www-form-urlencoded";
    webRequest.ContentType = "text/xml; charset=utf-8";

    // You should setContentLength
    byte[] content = System.Text.Encoding.UTF8.GetBytes(mXml);
    webRequest.ContentLength = content.Length;

    var reqStream = await webRequest.GetRequestStreamAsync();
    reqStream.Write(content, 0, content.Length);

    var res = await httpRequest(webRequest);

}

score 0 · Answer 6 · answered Jul 11 '11 at 06:25

0

If you don't want to wait for response you can send data in another thread or simple use WebClient.UploadStringAsync, but note that response always take place after request. Using another thread for request allows you to ignore response processing.

answered Jul 11 '11 at 06:25

Alexander

1,287
1
15
34

Send http request to server without expecting a response

6 Answers6

Linked