diff --git a/examples/src/middleware/CacheHandler.php b/examples/src/middleware/CacheHandler.php
new file mode 100644
index 00000000..2b163c7a
--- /dev/null
+++ b/examples/src/middleware/CacheHandler.php
@@ -0,0 +1,22 @@
+<?php
+
+class CacheHandler {
+    private $cache = array();
+    function handle($name, array &$args, stdClass $context, Closure $next) {
+        if (isset($context->userdata->cache)) {
+            $key = hprose_serialize($args);
+            if (isset($this->cache[$name])) {
+                if (isset($this->cache[$name][$key])) {
+                    return $this->cache[$name][$key];
+                }
+            }
+            else {
+                $this->cache[$name] = array();
+            }
+            $result = $next($name, $args, $context);
+            $this->cache[$name][$key] = $result;
+            return $result;
+        }
+        return $next($name, $args, $context);
+    }
+}
diff --git a/examples/src/middleware/CacheHandler2.php b/examples/src/middleware/CacheHandler2.php
new file mode 100644
index 00000000..2dc3a5d7
--- /dev/null
+++ b/examples/src/middleware/CacheHandler2.php
@@ -0,0 +1,16 @@
+<?php
+
+class CacheHandler2 {
+    private $cache = array();
+    function handle($request, stdClass $context, Closure $next) {
+        if (isset($context->userdata->cache)) {
+            if (isset($this->cache[$request])) {
+                return $this->cache[$request];
+            }
+            $response = $next($request, $context);
+            $this->cache[$request] = $response;
+            return $response;
+        }
+        return $next($request, $context);
+    }
+}
diff --git a/examples/src/middleware/SizeHandler.php b/examples/src/middleware/SizeHandler.php
new file mode 100644
index 00000000..955a1fed
--- /dev/null
+++ b/examples/src/middleware/SizeHandler.php
@@ -0,0 +1,19 @@
+<?php
+
+class SizeHandler {
+    private $message;
+    public function __construct($message) {
+        $this->message = $message;
+    }
+    public function asynchandle($request, stdClass $context, Closure $next) {
+        error_log($this->message . ' request size: ' . strlen($request));
+        $response = (yield $next($request, $context));
+        error_log($this->message . ' response size: ' . strlen($response));
+    }
+    public function synchandle($request, stdClass $context, Closure $next) {
+        error_log($this->message . ' request size: ' . strlen($request));
+        $response = $next($request, $context);
+        error_log($this->message . ' response size: ' . strlen($response));
+        return $response;
+    }
+}
diff --git a/examples/src/middleware/StatHandler.php b/examples/src/middleware/StatHandler.php
new file mode 100644
index 00000000..59649325
--- /dev/null
+++ b/examples/src/middleware/StatHandler.php
@@ -0,0 +1,21 @@
+<?php
+
+class StatHandler {
+    private $message;
+    public function __construct($message) {
+        $this->message = $message;
+    }
+    public function asynchandle($request, stdClass $context, Closure $next) {
+        $start = microtime(true);
+        yield $next($request, $context);
+        $end = microtime(true);
+        error_log($this->message . ': It takes ' . ($end - $start) . 'ms.');
+    }
+    public function synchandle($request, stdClass $context, Closure $next) {
+        $start = microtime(true);
+        $response = $next($request, $context);
+        $end = microtime(true);
+        error_log($this->message . ': It takes ' . ($end - $start) . 'ms.');
+        return $response;
+    }
+}
diff --git a/examples/src/middleware/exam3/Client.php b/examples/src/middleware/exam3/Client.php
new file mode 100644
index 00000000..c6f3b2bd
--- /dev/null
+++ b/examples/src/middleware/exam3/Client.php
@@ -0,0 +1,16 @@
+<?php
+require_once "../../../vendor/autoload.php";
+require_once '../logHandler.php';
+require_once '../CacheHandler.php';
+
+use Hprose\Client;
+use Hprose\InvokeSettings;
+
+$cacheSettings = new InvokeSettings(array("userdata" => array("cache" => true)));
+$client = Client::create('tcp://127.0.0.1:1143/', false);
+$client->addInvokeHandler(array(new CacheHandler(), 'handle'));
+$client->addInvokeHandler($logHandler);
+var_dump($client->hello("cache world", $cacheSettings));
+var_dump($client->hello("cache world", $cacheSettings));
+var_dump($client->hello("no cache world"));
+var_dump($client->hello("no cache world"));
diff --git a/examples/src/middleware/exam3/Server.php b/examples/src/middleware/exam3/Server.php
new file mode 100644
index 00000000..23d8083f
--- /dev/null
+++ b/examples/src/middleware/exam3/Server.php
@@ -0,0 +1,16 @@
+<?php
+require_once "../../../vendor/autoload.php";
+require_once '../logHandler.php';
+
+use Hprose\Socket\Server;
+
+function hello($name) {
+    return "Hello $name!";
+}
+
+$server = new Server('tcp://0.0.0.0:1143/');
+$server->addFunction('hello');
+$server->debug = true;
+$server->addInvokeHandler($logHandler);
+$server->start();
+
diff --git a/examples/src/middleware/exam4/Client.php b/examples/src/middleware/exam4/Client.php
new file mode 100644
index 00000000..ac213158
--- /dev/null
+++ b/examples/src/middleware/exam4/Client.php
@@ -0,0 +1,9 @@
+<?php
+require_once "../../../vendor/autoload.php";
+require_once '../logHandler2.php';
+
+use Hprose\Client;
+
+$client = Client::create('tcp://127.0.0.1:1143/', false);
+$client->addBeforeFilterHandler($logHandler2);
+var_dump($client->hello("world"));
diff --git a/examples/src/middleware/exam4/Server.php b/examples/src/middleware/exam4/Server.php
new file mode 100644
index 00000000..ce3cf0d4
--- /dev/null
+++ b/examples/src/middleware/exam4/Server.php
@@ -0,0 +1,16 @@
+<?php
+require_once "../../../vendor/autoload.php";
+require_once '../logHandler2.php';
+
+use Hprose\Socket\Server;
+
+function hello($name) {
+    return "Hello $name!";
+}
+
+$server = new Server('tcp://0.0.0.0:1143/');
+$server->addFunction('hello');
+$server->debug = true;
+$server->addBeforeFilterHandler($logHandler2);
+$server->start();
+
diff --git a/examples/src/middleware/exam5/Client.php b/examples/src/middleware/exam5/Client.php
new file mode 100644
index 00000000..e27c75db
--- /dev/null
+++ b/examples/src/middleware/exam5/Client.php
@@ -0,0 +1,24 @@
+<?php
+require_once "../../../vendor/autoload.php";
+require_once '../../filter/CompressFilter.php';
+require_once '../SizeHandler.php';
+require_once '../StatHandler.php';
+require_once '../CacheHandler2.php';
+
+use Hprose\Client;
+use Hprose\InvokeSettings;
+
+$cacheSettings = new InvokeSettings(array("userdata" => array("cache" => true)));
+
+$client = Client::create('tcp://127.0.0.1:1143/', false);
+$client->addBeforeFilterHandler(array(new CacheHandler2(), 'handle'))
+       ->addBeforeFilterHandler(array(new StatHandler('BeforeFilter'), 'synchandle'))
+       ->addBeforeFilterHandler(array(new SizeHandler('Non compressed'), 'synchandle'))
+       ->addFilter(new CompressFilter())
+       ->addAfterFilterHandler(array(new StatHandler('AfterFilter'), 'synchandle'))
+       ->addAfterFilterHandler(array(new SizeHandler('compressed'), 'synchandle'));
+
+$value = range(0, 99999);
+var_dump(count($client->echo($value, $cacheSettings)));
+var_dump(count($client->echo($value, $cacheSettings)));
+
diff --git a/examples/src/middleware/exam5/Server.php b/examples/src/middleware/exam5/Server.php
new file mode 100644
index 00000000..c172a5c5
--- /dev/null
+++ b/examples/src/middleware/exam5/Server.php
@@ -0,0 +1,16 @@
+<?php
+require_once "../../../vendor/autoload.php";
+require_once '../../filter/CompressFilter.php';
+require_once '../SizeHandler.php';
+require_once '../StatHandler.php';
+
+use Hprose\Socket\Server;
+
+$server = new Server('tcp://0.0.0.0:1143/');
+$server->addFunction(function($value) { return $value; }, 'echo')
+       ->addBeforeFilterHandler(array(new StatHandler("BeforeFilter"), 'asynchandle'))
+       ->addBeforeFilterHandler(array(new SizeHandler("compressedr"), 'asynchandle'))
+       ->addFilter(new CompressFilter())
+       ->addAfterFilterHandler(array(new StatHandler("AfterFilter"), 'asynchandle'))
+       ->addAfterFilterHandler(array(new SizeHandler("Non compressed"), 'asynchandle'))
+       ->start();
diff --git a/examples/src/middleware/logHandler2.php b/examples/src/middleware/logHandler2.php
new file mode 100644
index 00000000..7fe63fa8
--- /dev/null
+++ b/examples/src/middleware/logHandler2.php
@@ -0,0 +1,10 @@
+<?php
+
+use Hprose\Future;
+
+$logHandler2 = function($request, stdClass $context, Closure $next) {
+    error_log($request);
+    $response = $next($request, $context);
+    Future\run('error_log', $response);
+    return $response;
+};
\ No newline at end of file