Update metric data retrieval configurations with additional details and proxy server setting.

- Restructured config to include 'http' with url and data fields for each metric. Added metrics 3 and 4 with specific data outputs.

config.example.php

@@ -7,7 +7,25 @@ $config = [
 	],
 	'app_demo_metric2' => [ 
 		'help' => 'Help text for metric',
-		'httpurl' => 'http://example.com', // The url to get collected for the metric
+		'http' => [
+            'url' => 'http://example.com', // The url to get collected for the metric
+            'data' => 'responsebody', // The body is used as output
+        ],
 		'jsonelem' => '0.metric',
 	],
+    'app_demo_metric3' => [
+        'help' => 'Help text for metric',
+        'http' => [
+            'url' => 'http://example.com', // The url to get collected for the metric
+            'data' => 'hasresponse', // If an error occured during request this will return 0, otherwise 1
+        ],
+    ],
+    'app_demo_metric4' => [
+        'help' => 'Help text for metric',
+        'http' => [
+            'url' => 'http://example.com', // The url to get collected for the metric
+            'data' => 'responsetime', // This will return the transfer time
+            'proxy' => 'http://192.168.1.252:8080', // The proxy server the request needs to use
+        ],
+    ],
 ];

index.php

@@ -2,20 +2,46 @@
 require 'vendor/autoload.php';
 require 'config.php';
 
-if($_SERVER["REQUEST_URI"] == '/metrics') {
+if($_SERVER["REQUEST_URI"] == '/metrics' || php_sapi_name() == 'cli') {
     foreach ($config as $key => &$c) {
         if(isset($c['command'])) {
             $output=null;
             $retval=null;
             exec($c['command'], $output, $retval);
             $output = implode("\n", $output);
-		} elseif(isset($c['httpurl'])) {
+        } elseif(isset($c['http'])) {
             $client = new GuzzleHttp\Client();
-			$res = $client->get($c['httpurl']);
-			$output = $res->getBody()->getContents();
+
+            $options = [];
+            $output = NULL;
+            if (isset($c['http']['proxy'])) {
+                $options['proxy'] = $c['http']['proxy'];
             }
+            if (isset($c['http']['data']) && $c['http']['data'] == 'responsetime') {
+                $options['on_stats'] = function (GuzzleHttp\TransferStats $stats) use (&$output) {
+                    $output = $stats->getTransferTime();
+                };
+            }
+
+            $hasresponse = NULL;
+            try{
+                $res = $client->request('GET', $c['http']['url'], $options);
+                $hasresponse = true;
+            } catch(GuzzleHttp\Exception\GuzzleException $e) {
+                $hasresponse = false;
+            }
+
+            if (isset($c['http']['data']) && $c['http']['data'] == 'responsebody') {
+                $output = $res->getBody()->getContents();
+            } elseif (isset($c['http']['data']) && $c['http']['data'] == 'hasresponse') {
+                $output = (int)$hasresponse;
+            }
+        }
+
         if(isset($c['jsonelem'])) {
             $c['value'] = getArrayValue($c['jsonelem'], json_decode($output, true));
+        } else {
+            $c['value'] = $output;
         }
     }