diff --git a/02nio/nio02/src/main/java/io/github/kimmking/gateway/filter/AddNameToRequestHeaderFilter.java b/02nio/nio02/src/main/java/io/github/kimmking/gateway/filter/AddNameToRequestHeaderFilter.java
new file mode 100644
index 00000000..f87bde75
--- /dev/null
+++ b/02nio/nio02/src/main/java/io/github/kimmking/gateway/filter/AddNameToRequestHeaderFilter.java
@@ -0,0 +1,13 @@
+package io.github.kimmking.gateway.filter;
+
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.http.*;
+
+public class AddNameToRequestHeaderFilter implements HttpRequestFilter {
+
+    @Override
+    public void filter(FullHttpRequest fullRequest, ChannelHandlerContext ctx) {
+        HttpHeaders headers = fullRequest.headers();
+        headers.add("nio", "soda");
+    }
+}
diff --git a/02nio/nio02/src/main/java/io/github/kimmking/gateway/inbound/HttpInboundHandler.java b/02nio/nio02/src/main/java/io/github/kimmking/gateway/inbound/HttpInboundHandler.java
index 22fb2525..28112957 100644
--- a/02nio/nio02/src/main/java/io/github/kimmking/gateway/inbound/HttpInboundHandler.java
+++ b/02nio/nio02/src/main/java/io/github/kimmking/gateway/inbound/HttpInboundHandler.java
@@ -1,5 +1,7 @@
 package io.github.kimmking.gateway.inbound;
 
+import io.github.kimmking.gateway.filter.AddNameToRequestHeaderFilter;
+import io.github.kimmking.gateway.filter.HttpRequestFilter;
 import io.github.kimmking.gateway.outbound.httpclient4.HttpOutboundHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
@@ -13,10 +15,12 @@ public class HttpInboundHandler extends ChannelInboundHandlerAdapter {
     private static Logger logger = LoggerFactory.getLogger(HttpInboundHandler.class);
     private final String proxyServer;
     private HttpOutboundHandler handler;
+    private HttpRequestFilter filter;
     
     public HttpInboundHandler(String proxyServer) {
         this.proxyServer = proxyServer;
         handler = new HttpOutboundHandler(this.proxyServer);
+        filter = new AddNameToRequestHeaderFilter();
     }
     
     @Override
@@ -34,7 +38,8 @@ public void channelRead(ChannelHandlerContext ctx, Object msg) {
 //            if (uri.contains("/test")) {
 //                handlerTest(fullRequest, ctx);
 //            }
-    
+
+            filter.filter(fullRequest, ctx);
             handler.handle(fullRequest, ctx);
     
         } catch(Exception e) {
diff --git a/02nio/nio02/src/main/java/io/github/kimmking/gateway/outbound/httpclient4/HttpOutboundHandler.java b/02nio/nio02/src/main/java/io/github/kimmking/gateway/outbound/httpclient4/HttpOutboundHandler.java
index 856dc168..aaa3d4b5 100644
--- a/02nio/nio02/src/main/java/io/github/kimmking/gateway/outbound/httpclient4/HttpOutboundHandler.java
+++ b/02nio/nio02/src/main/java/io/github/kimmking/gateway/outbound/httpclient4/HttpOutboundHandler.java
@@ -17,6 +17,7 @@
 import org.apache.http.protocol.HTTP;
 import org.apache.http.util.EntityUtils;
 
+import java.util.Map;
 import java.util.concurrent.*;
 
 import static io.netty.handler.codec.http.HttpResponseStatus.NO_CONTENT;
@@ -62,6 +63,9 @@ public void handle(final FullHttpRequest fullRequest, final ChannelHandlerContex
     private void fetchGet(final FullHttpRequest inbound, final ChannelHandlerContext ctx, final String url) {
         final HttpGet httpGet = new HttpGet(url);
         //httpGet.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
+        for (Map.Entry<String, String> header : inbound.headers()) {
+            httpGet.setHeader(header.getKey(), header.getValue());
+        }
         httpGet.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
         httpclient.execute(httpGet, new FutureCallback<HttpResponse>() {
             @Override
@@ -95,13 +99,14 @@ private void handleResponse(final FullHttpRequest fullRequest, final ChannelHand
 //            response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(value.getBytes("UTF-8")));
 //            response.headers().set("Content-Type", "application/json");
 //            response.headers().setInt("Content-Length", response.content().readableBytes());
-    
-    
+            //作业第一步，把从后端拿到响应内容，换成写死的helloworld
             byte[] body = EntityUtils.toByteArray(endpointResponse.getEntity());
-//            System.out.println(new String(body));
-//            System.out.println(body.length);
+            System.out.println("httpClient proxy got body: " + new String(body));
+            //写死的替换内容
+            String homeworkResp = "helloworld";
+            System.out.println("homework step3, change resp to `helloworld`");
     
-            response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(body));
+            response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(homeworkResp.getBytes()));
             response.headers().set("Content-Type", "application/json");
             response.headers().setInt("Content-Length", Integer.parseInt(endpointResponse.getFirstHeader("Content-Length").getValue()));