Improve examples to use proper error handlers

Author: clue

README.md

@@ -82,6 +82,8 @@ $connector = new React\Socket\Connector();
 $connector->connect('127.0.0.1:8080')->then(function (React\Socket\ConnectionInterface $connection) {
     $connection->pipe(new React\Stream\WritableResourceStream(STDOUT));
     $connection->write("Hello World!\n");
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
 });
 ```
 
@@ -905,6 +907,8 @@ $connector = new React\Socket\Connector();
 $connector->connect($uri)->then(function (React\Socket\ConnectionInterface $connection) {
     $connection->write('...');
     $connection->end();
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
 });
 ```
 

examples/11-http-client.php

@@ -29,4 +29,6 @@
     });
 
     $connection->write("GET / HTTP/1.0\r\nHost: $host\r\n\r\n");
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});

examples/12-https-client.php

@@ -29,4 +29,6 @@
     });
 
     $connection->write("GET / HTTP/1.0\r\nHost: $host\r\n\r\n");
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});

examples/21-netcat-client.php

@@ -48,8 +48,8 @@
     $connection->pipe($stdout);
 
     // report errors to STDERR
-    $connection->on('error', function ($error) use ($stderr) {
-        $stderr->write('Stream ERROR: ' . $error . PHP_EOL);
+    $connection->on('error', function (Exception $e) use ($stderr) {
+        $stderr->write('Stream error: ' . $e->getMessage() . PHP_EOL);
     });
 
     // report closing and stop reading from input
@@ -59,6 +59,6 @@
     });
 
     $stderr->write('Connected' . PHP_EOL);
-}, function ($error) use ($stderr) {
-    $stderr->write('Connection ERROR: ' . $error . PHP_EOL);
+}, function (Exception $e) use ($stderr) {
+    $stderr->write('Connection error: ' . $e->getMessage() . PHP_EOL);
 });

examples/22-http-client.php

@@ -53,4 +53,6 @@
     $connection->pipe($stdout);
 
     $connection->write("GET $resource HTTP/1.0\r\nHost: $host\r\n\r\n");
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});