diff --git a/README.md b/README.md
index 1497557..bbdd49a 100644
--- a/README.md
+++ b/README.md
@@ -205,7 +205,9 @@ $connector->connect('tls://smtp.googlemail.com:465')->then(function (ConnectionI
 
 This library also allows you to send HTTP requests through an HTTP CONNECT proxy server.
 
-In order to send HTTP requests, you first have to add a dependency for [ReactPHP's async HTTP client](https://github.com/reactphp/http#client-usage). This allows you to send both plain HTTP and TLS-encrypted HTTPS requests like this:
+In order to send HTTP requests, you first have to add a dependency for
+[ReactPHP's async HTTP client](https://github.com/reactphp/http#client-usage).
+This allows you to send both plain HTTP and TLS-encrypted HTTPS requests like this:
 
 ```php
 $proxy = new Clue\React\HttpProxy\ProxyConnector(
@@ -222,10 +224,13 @@ $browser = new React\Http\Browser($loop, $connector);
 
 $browser->get('https://example.com/')->then(function (Psr\Http\Message\ResponseInterface $response) {
     var_dump($response->getHeaders(), (string) $response->getBody());
-}); 
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 ```
 
-See also [ReactPHP's HTTP client](https://github.com/reactphp/http#client-usage) and any of the [examples](examples) for more details.
+See also [ReactPHP's HTTP client](https://github.com/reactphp/http#client-usage)
+and any of the [examples](examples) for more details.
 
 #### Connection timeout
 
diff --git a/examples/01-http-request.php b/examples/01-http-request.php
index 66bd786..90b00ef 100644
--- a/examples/01-http-request.php
+++ b/examples/01-http-request.php
@@ -8,11 +8,11 @@
 // The proxy defaults to localhost:8080.
 // To run the example go to the project root and run:
 //
-// $ php examples/01-http-requests.php
+// $ php examples/01-http-request.php
 //
 // To run the same example with your proxy, the proxy URL can be given as an environment variable:
 //
-// $ http_proxy=127.0.0.2:8080 php examples/01-http-requests.php
+// $ http_proxy=127.0.0.2:8080 php examples/01-http-request.php
 
 require __DIR__ . '/../vendor/autoload.php';
 
@@ -33,6 +33,8 @@
 
 $browser->get('https://example.com/')->then(function (Psr\Http\Message\ResponseInterface $response) {
     var_dump($response->getHeaders(), (string) $response->getBody());
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 
 $loop->run();
diff --git a/examples/02-optional-proxy-http-request.php b/examples/02-optional-proxy-http-request.php
index 170ea7a..92a31ca 100644
--- a/examples/02-optional-proxy-http-request.php
+++ b/examples/02-optional-proxy-http-request.php
@@ -33,6 +33,8 @@
 
 $browser->get('https://example.com/')->then(function (Psr\Http\Message\ResponseInterface $response) {
     var_dump($response->getHeaders(), (string) $response->getBody());
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 
 $loop->run();
diff --git a/examples/11-proxy-raw-https-protocol.php b/examples/11-proxy-raw-https-protocol.php
index 873b39b..51a34bc 100644
--- a/examples/11-proxy-raw-https-protocol.php
+++ b/examples/11-proxy-raw-https-protocol.php
@@ -42,6 +42,8 @@
     $stream->on('data', function ($chunk) {
         echo $chunk;
     });
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 
 $loop->run();
diff --git a/examples/12-optional-proxy-raw-https-protocol.php b/examples/12-optional-proxy-raw-https-protocol.php
index ed206fe..fa349d0 100644
--- a/examples/12-optional-proxy-raw-https-protocol.php
+++ b/examples/12-optional-proxy-raw-https-protocol.php
@@ -45,6 +45,8 @@
     $stream->on('data', function ($chunk) {
         echo $chunk;
     });
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 
 $loop->run();
diff --git a/examples/13-custom-proxy-headers.php b/examples/13-custom-proxy-headers.php
index 09163af..cf708e1 100644
--- a/examples/13-custom-proxy-headers.php
+++ b/examples/13-custom-proxy-headers.php
@@ -45,6 +45,8 @@
     $stream->on('data', function ($chunk) {
         echo $chunk;
     });
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 
 $loop->run();
diff --git a/examples/21-proxy-raw-smtp-protocol.php b/examples/21-proxy-raw-smtp-protocol.php
index bab1605..3088b5c 100644
--- a/examples/21-proxy-raw-smtp-protocol.php
+++ b/examples/21-proxy-raw-smtp-protocol.php
@@ -42,6 +42,8 @@
         echo $chunk;
         $stream->write("QUIT\r\n");
     });
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 
 $loop->run();
diff --git a/examples/22-proxy-raw-smtps-protocol.php b/examples/22-proxy-raw-smtps-protocol.php
index 82aa2cf..2317a95 100644
--- a/examples/22-proxy-raw-smtps-protocol.php
+++ b/examples/22-proxy-raw-smtps-protocol.php
@@ -45,6 +45,8 @@
         echo $chunk;
         $stream->write("QUIT\r\n");
     });
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});
 
 $loop->run();