fix issues with keep alive

unknow-server-http/src/main/java/unknow/server/http/HttpConnection.java

@@ -30,8 +30,8 @@ public class HttpConnection extends NIOConnection {
 	private Future<?> exec = CompletableFuture.completedFuture(null);
 	private HttpProcessor p;
 
-	protected final ServletResponseImpl res;
-	protected final ServletRequestImpl req;
+	protected ServletResponseImpl res;
+	protected ServletRequestImpl req;
 
 	/**
 	 * create new RequestBuilder
@@ -42,8 +42,6 @@ protected HttpConnection(ExecutorService executor, ServletContextImpl ctx, int k
 		this.executor = executor;
 		this.keepAliveIdle = keepAliveIdle;
 		this.ctx = ctx;
-		this.res = new ServletResponseImpl(this);
-		this.req = new ServletRequestImpl(this, DispatcherType.REQUEST);
 	}
 
 	@Override
@@ -57,6 +55,8 @@ public final void onRead() throws InterruptedException {
 			return;
 		if (!p.init(this))
 			return;
+		res = new ServletResponseImpl(this);
+		req = new ServletRequestImpl(this, DispatcherType.REQUEST);
 		exec = executor.submit(p);
 	}
 

unknow-server-http/src/main/java/unknow/server/http/HttpProcessor.java

@@ -63,9 +63,8 @@ public void run() {
 				out.flush();
 			}
 
-			close = keepAliveIdle == 0 || !"keep-alive".equals(req.getHeader("connection"));
-			if (!close)
-				res.setHeader("connection", "keep-alive");
+			close = keepAliveIdle == 0 || !"keep-alive".equalsIgnoreCase(req.getHeader("connection"));
+			res.setHeader("connection", close ? "close" : "keep-alive");
 			events.fireRequestInitialized(req);
 			doRun(req, res);
 			events.fireRequestDestroyed(req);

unknow-server-nio/src/main/java/unknow/server/nio/NIOLoop.java

@@ -99,9 +99,10 @@ public final void run() {
 	}
 
 	private final void select(long timeout, boolean close) throws IOException, InterruptedException {
-		if (selector.select(timeout) == 0)
-			return;
+		int l = selector.select(timeout);
 		onSelect(close);
+		if (l == 0)
+			return;
 		Iterator<SelectionKey> it = selector.selectedKeys().iterator();
 
 		while (it.hasNext()) {