Exchange of data through socket connection.

[BPS]

Hello, i want to create basic example of 2 apps which will be 
exchanging data through socket connection. I have:

server
======
import std.stdio;
import std.string;
import std.socket;


void main()
{
	auto sock = new Socket(AddressFamily.INET, SocketType.STREAM, 
ProtocolType.IP);
	sock.bind(new InternetAddress("0.0.0.0", 7777));
	sock.listen(1);
	Socket incommingConn = sock.accept();

	void[] buff;
	incommingConn.receive(buff);
	writeln((cast(ubyte[])buff).assumeUTF());

	buff = cast(void[])representation("OK.");
	incommingConn.send(buff);
	incommingConn.close();
	sock.close();
}

Client
======
import std.stdio;
import std.string;
import std.socket;


void main()
{
	auto sock = new Socket(AddressFamily.INET, SocketType.STREAM, 
ProtocolType.IP);
	sock.connect(new InternetAddress("0.0.0.0", 7777));
	void[] buff = ['a', 's', 'd', 'f'];
	sock.send(buff);
	sock.receive(buff);
	writeln((cast(ubyte[])buff).assumeUTF());
	sock.close();
}


I was expecting to see string "asdf" in server terminal, but 
there is only blank line. Also client prints "OK.f" instead of 
"Ok.". I'm doing something wrong?