diff --git a/client_http.hpp b/client_http.hpp
index ac5573a..d7f1228 100644
--- a/client_http.hpp
+++ b/client_http.hpp
@@ -99,12 +99,6 @@ namespace SimpleWeb {
         };
         
     protected:
-        class RequestCallback {
-        public:
-            bool stop=false;
-            std::mutex stop_mutex;
-        };
-        
         class Connection {
         public:
             Connection(const std::string &host, unsigned short port, const Config &config, std::unique_ptr<socket_type> &&socket) :
diff --git a/http_examples.cpp b/http_examples.cpp
index cfd2e58..64ef3b6 100644
--- a/http_examples.cpp
+++ b/http_examples.cpp
@@ -163,6 +163,10 @@ int main() {
         }
     };
     
+    server.on_error=[](std::shared_ptr<HttpServer::Request> /*request*/, const SimpleWeb::error_code &/*ec*/) {
+        // handle errors here
+    };
+    
     thread server_thread([&server](){
         //Start server
         server.start();
@@ -173,6 +177,8 @@ int main() {
     
     //Client examples
     HttpClient client("localhost:8080");
+    
+    // synchronous request examples
     auto r1=client.request("GET", "/match/123");
     cout << r1->content.rdbuf() << endl;
 
@@ -180,8 +186,13 @@ int main() {
     auto r2=client.request("POST", "/string", json_string);
     cout << r2->content.rdbuf() << endl;
     
-    auto r3=client.request("POST", "/json", json_string);
-    cout << r3->content.rdbuf() << endl;
+    // asynchronous request example
+    client.request("POST", "/json", json_string, [](std::shared_ptr<HttpClient::Response> response, const SimpleWeb::error_code &ec) {
+        if(!ec)
+            cout << response->content.rdbuf() << endl;
+    });
+    client.io_service->reset(); // needed because the io_service has been run already in the synchronous examples
+    client.io_service->run();
     
     server_thread.join();
     
diff --git a/https_examples.cpp b/https_examples.cpp
index ec7a0b7..69d562b 100644
--- a/https_examples.cpp
+++ b/https_examples.cpp
@@ -159,6 +159,10 @@ int main() {
         }
     };
     
+    server.on_error=[](std::shared_ptr<HttpsServer::Request> /*request*/, const SimpleWeb::error_code &/*ec*/) {
+        // handle errors here
+    };
+    
     thread server_thread([&server](){
         //Start server
         server.start();
@@ -170,6 +174,8 @@ int main() {
     //Client examples
     //Second Client() parameter set to false: no certificate verification
     HttpsClient client("localhost:8080", false);
+    
+    // synchronous request examples
     auto r1=client.request("GET", "/match/123");
     cout << r1->content.rdbuf() << endl;
 
@@ -177,8 +183,13 @@ int main() {
     auto r2=client.request("POST", "/string", json_string);
     cout << r2->content.rdbuf() << endl;
     
-    auto r3=client.request("POST", "/json", json_string);
-    cout << r3->content.rdbuf() << endl;
+    // asynchronous request example
+    client.request("POST", "/json", json_string, [](std::shared_ptr<HttpsClient::Response> response, const SimpleWeb::error_code &ec) {
+        if(!ec)
+            cout << response->content.rdbuf() << endl;
+    });
+    client.io_service->reset(); // needed because the io_service has been run already in the synchronous examples
+    client.io_service->run();
     
     server_thread.join();