use .env to configure proxy

app/Sensor/ClientVersion.php

@@ -18,8 +18,8 @@ class ClientVersion extends \App\AbstractSensor
     {
         $options = ['timeout' => 5.0];
 
-        $proxy = getenv("https_proxy");
-        if ($proxy != false) {
+        $proxy = config("app.proxy", null);
+        if ($proxy != null) {
             $options["proxy"] = $proxy;
         }
 

config/app.php

@@ -15,6 +15,8 @@ return [
 
     'name' => env('APP_NAME', 'Monitoring'),
 
+    'proxy' => env('PROXY', null),
+
     /*
     |--------------------------------------------------------------------------
     | Application Environment