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Question
Tuesday, May 27, 2014 4:26 AM
Hi all,
I want to develop a simple console Application in C# that wll handle Http Requests and sends the response back to a Browser or any other Client that sends a Http Request to this Console Application. Currently, I am using a Socket to listen on a port for a Http Request and I don't know how to generate the Http Response for the received request. I am poting here the code of my Console Application. Could someone help me on how to construct a Http Response to a request from my console Application?
private void Handler()
{
bool recvRequest = true;
string EOL = "\r\n";
int bodylength = 0;
string requestPayload = "";
string requestTempLine = "";
List<string> requestLines = new List<string>();
byte[] requestBuffer = new byte[1];
byte[] responseBuffer = new byte[1];
requestLines.Clear();
try
{
//State 0: Handle Request from Client
while (recvRequest)
{
while (this.clientSocket.Available != 0)
{
this.clientSocket.Receive(requestBuffer);
string fromByte = ASCIIEncoding.ASCII.GetString(requestBuffer);
requestPayload += fromByte;
requestTempLine += fromByte;
if (requestTempLine.EndsWith(EOL))
{
requestLines.Add(requestTempLine.Trim());
requestTempLine = "";
}
if (requestPayload.Contains(EOL + EOL))
{
string[] list = requestLines.ToArray();
string body = "";
foreach (string s in list)
{
if (s.Contains("Content-Length"))
{
bodylength = Convert.ToInt32(s.Split(':')[1]);
for (int i = 0; i < bodylength; i++)
{
this.clientSocket.Receive(requestBuffer);
fromByte = ASCIIEncoding.ASCII.GetString(requestBuffer);
body += fromByte;
}
requestPayload += body;
requestLines.Add(body);
AccountNo = Convert.ToInt64(body.Split('&')[0].Split('=')[1]);
Amount = Convert.ToInt64(body.Split('&')[1].Split('=')[1]);
}
}
recvRequest = false;
}
}
}
Console.WriteLine("Raw Request Received...as \n {0}",requestPayload);
/*
Need to insert the code for constructing a Http Response and send back to the Client...
*/
Thanks,
K.V.N.PAVAN
All replies (3)
Tuesday, June 3, 2014 9:48 AM âś…Answered
Hi Pa1 Kumar,
To build a Http server, you need to understand Http.
http://www.w3.org/Protocols/rfc2616/rfc2616.html
If you use some tools like Fiddler or HttpWatch or something like this, you'll find that a Http response looks like this:
HTTP/1.1 200 OK
Last-Modified: Wed, 17 Oct 2007 03:01:41 GMT
Content-Type: text/html
Content-Length: 158
Date: Wed, 17 Oct 2007 03:01:59 GMT
Server: Apache-Coyote/1.1
...
It consists of four parts, the status line(HTTP/1.1 200 OK), the response header(Content-Type:text/html...), an empty line and the response body. So in your Http server, when you receive a Http request using Socket, you need to send a string content just like this. The client web browser only recogonize the strings that is formatted as Http response.
I just made an example a few days before, here's the code snippet, hope it can help you:
IPAddress localaddress = IPAddress.Loopback;
IPEndPoint endpoint = new IPEndPoint(localaddress, 11111);
Console.WriteLine(string.Format("Listening port:{0}",11111));
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Bind(endpoint);
socket.Listen(10);
Console.WriteLine("Waiting for http request...\r\n");
Socket clientsocket = socket.Accept();
Console.WriteLine("Client connected: {0}\r\n", clientsocket.RemoteEndPoint);
byte[] buffer = new byte[1024];
int receivelength = clientsocket.Receive(buffer, 1024, SocketFlags.None);
string requeststring = Encoding.UTF8.GetString(buffer, 0, receivelength);
Console.WriteLine(requeststring);
string statusLine = "HTTP/1.1 200 OK\r\n";
string responseHeader = "Content-Type: text/html\r\n";
string responseBody = "<html><head><title>Hello World!</title></head><body><div>Hello World!</div></body></html>";
clientsocket.Send(Encoding.UTF8.GetBytes(statusLine));
clientsocket.Send(Encoding.UTF8.GetBytes(responseHeader));
clientsocket.Send(Encoding.UTF8.GetBytes("\r\n"));
clientsocket.Send(Encoding.UTF8.GetBytes(responseBody));
clientsocket.Close();
Console.ReadLine();
socket.Close();
For all information of the response code, please check the 10th chapter of the above document:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
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Wednesday, May 28, 2014 6:41 AM
Hello,
Take a look at the System.Net.WebClient class, it can be used to issue requests and handle their responses, as well as to download files:
http://www.hanselman.com/blog/HTTPPOSTsAndHTTPGETsWithWebClientAndCAndFakingAPostBack.aspx
http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx
Thanks.
Wednesday, May 28, 2014 2:23 PM
Hi Diana,
Thanks for the reply, but I atually need a server functionality where the Console Application acts as a Server and responds with a Http Response for the incoming Http Requests. I think the System.Net.WebClient class will be dealing more with Client Functionality . Do you find some other way for server functionality.
Thanks,
K.V.N.PAVAN