Tutorial, Doc: Added second chapter for network tutorial. It is about building RESTful server.

tutorial/Network02/Network02.cpp

@@ -0,0 +1,57 @@
+#include <Core/Core.h>
+
+using namespace Upp;
+
+constexpr int port = 4000;
+
+void ProcessHttpRequest(TcpSocket& client)
+{
+	HttpHeader header;
+	if(!header.Read(client)) {
+		Cerr() << "Failed to read HttpHeader.\n";
+		HttpResponse(client, false, 400, "Invalid request");
+		return;
+	}
+
+	auto path = header.GetURI();
+	if(header.GetMethod() == "GET") {
+		if(path == "/countries") {
+			JsonArray ja;
+			ja << "Czech Republic"
+			   << "Indonesia"
+			   << "Brazil"
+			   << "France";
+
+			HttpResponse(client, false, 200, "OK", "application/json", ja.ToString());
+		}
+	}
+
+	HttpResponse(client, false, 404, "Not found");
+}
+
+void RunServerLoop(TcpSocket& server)
+{
+	for(;;) {
+		TcpSocket client;
+
+		Cout() << "Waiting for incoming connection from the client...\n";
+		if(!client.Accept(server)) {
+			Cerr() << "Connection from the client not accepted.\n";
+			continue;
+		}
+
+		ProcessHttpRequest(client);
+	}
+}
+
+CONSOLE_APP_MAIN
+{
+	TcpSocket server;
+	if(!server.Listen(port)) {
+		Cerr() << "Cannot open server port for listening with error \"" << server.GetErrorDesc()
+			   << "\".\n";
+		return;
+	}
+
+	RunServerLoop(server);
+}

tutorial/Network02/Network02.upp

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+description "Creating simple REST service\377";
+
+uses
+	Core;
+
+file
+	Network02.cpp;
+
+mainconfig
+	"" = "";
+