diff --git a/03.网络编程与并发/01.网络编程基础.md b/03.网络编程与并发/01.网络编程基础.md
index a72bd71..d3e71b8 100644
--- a/03.网络编程与并发/01.网络编程基础.md
+++ b/03.网络编程与并发/01.网络编程基础.md
@@ -215,6 +215,7 @@ import socket
 
 phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
 phone.bind(('127.0.0.1',8080))
+phone.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 phone.listen(5)
 
 while 1:
@@ -222,16 +223,16 @@ while 1:
     print(conn,client_addr,sep='\n')
 
     while 1:
-        try:
+        if conn:
             from_client_data = conn.recv(1024)
+            if len(from_client_data) == 0 or from_client_data.decode('utf-8') == 'q':  
+                # 如果客户端返回为空或者q，说明已经断开
+                break
             print(from_client_data.decode('utf-8'))
-
             conn.send(from_client_data.upper())
-        except:
+        else:
             break
 
-conn.close()
-phone.close()
 ```
 
 客户端
@@ -244,9 +245,11 @@ phone.connect(('127.0.0.1',8080))
 
 while 1:
     client_data = input('>>> ')
+    if len(client_data.strip()) == 0:
+        continue
     phone.send(client_data.encode('utf-8'))
-    if client_data == 'q':break
-
+    if client_data == 'q':
+        break
     from_server_data = phone.recv(1024)
     print(from_server_data.decode('utf-8'))