diff --git a/.gitignore b/.gitignore
index 22d0d82..7579f74 100644
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@@ -1 +1,2 @@
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index d58ce11..99726b1 100644
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-                "sebastian/recursion-context": "~2.0"
-            },
-            "require-dev": {
-                "ext-mbstring": "*",
-                "phpunit/phpunit": "~4.4"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
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-            "autoload": {
-                "classmap": [
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-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
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-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
-                {
-                    "name": "Volker Dusch",
-                    "email": "github@wallbash.com"
-                },
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@2bepublished.at"
-                },
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-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                },
-                {
-                    "name": "Adam Harvey",
-                    "email": "aharvey@php.net"
-                }
-            ],
-            "description": "Provides the functionality to export PHP variables for visualization",
-            "homepage": "http://www.github.com/sebastianbergmann/exporter",
-            "keywords": [
-                "export",
-                "exporter"
-            ],
-            "time": "2016-11-19 08:54:04"
-        },
-        {
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-            "version": "1.1.1",
-            "source": {
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-                "reference": "bc37d50fea7d017d3d340f230811c9f1d7280af4",
-                "shasum": ""
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-            "require-dev": {
-                "phpunit/phpunit": "~4.2"
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-            "suggest": {
-                "ext-uopz": "*"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Snapshotting of global state",
-            "homepage": "http://www.github.com/sebastianbergmann/global-state",
-            "keywords": [
-                "global state"
-            ],
-            "time": "2015-10-12 03:26:01"
-        },
-        {
-            "name": "sebastian/object-enumerator",
-            "version": "2.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
-                "reference": "96f8a3f257b69e8128ad74d3a7fd464bcbaa3b35"
-            },
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-                "reference": "96f8a3f257b69e8128ad74d3a7fd464bcbaa3b35",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.6",
-                "sebastian/recursion-context": "~2.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~5"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
-            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
-            "time": "2016-11-19 07:35:10"
-        },
-        {
-            "name": "sebastian/recursion-context",
-            "version": "2.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/recursion-context.git",
-                "reference": "2c3ba150cbec723aa057506e73a8d33bdb286c9a"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/2c3ba150cbec723aa057506e73a8d33bdb286c9a",
-                "reference": "2c3ba150cbec723aa057506e73a8d33bdb286c9a",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.4"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                },
-                {
-                    "name": "Adam Harvey",
-                    "email": "aharvey@php.net"
-                }
-            ],
-            "description": "Provides functionality to recursively process PHP variables",
-            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2016-11-19 07:33:16"
-        },
-        {
-            "name": "sebastian/resource-operations",
-            "version": "1.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/resource-operations.git",
-                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
-                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.6.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Provides a list of PHP built-in functions that operate on resources",
-            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2015-07-28 20:34:47"
-        },
-        {
-            "name": "sebastian/version",
-            "version": "2.0.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/version.git",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.6"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
-                }
-            ],
-            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
-            "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2016-10-03 07:35:21"
-        },
-        {
-            "name": "squizlabs/php_codesniffer",
-            "version": "2.8.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "86dd55a522238211f9f3631e3361703578941d9a"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/86dd55a522238211f9f3631e3361703578941d9a",
-                "reference": "86dd55a522238211f9f3631e3361703578941d9a",
-                "shasum": ""
-            },
-            "require": {
-                "ext-simplexml": "*",
-                "ext-tokenizer": "*",
-                "ext-xmlwriter": "*",
-                "php": ">=5.1.2"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.0"
-            },
-            "bin": [
-                "scripts/phpcs",
-                "scripts/phpcbf"
-            ],
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "CodeSniffer.php",
-                    "CodeSniffer/CLI.php",
-                    "CodeSniffer/Exception.php",
-                    "CodeSniffer/File.php",
-                    "CodeSniffer/Fixer.php",
-                    "CodeSniffer/Report.php",
-                    "CodeSniffer/Reporting.php",
-                    "CodeSniffer/Sniff.php",
-                    "CodeSniffer/Tokens.php",
-                    "CodeSniffer/Reports/",
-                    "CodeSniffer/Tokenizers/",
-                    "CodeSniffer/DocGenerators/",
-                    "CodeSniffer/Standards/AbstractPatternSniff.php",
-                    "CodeSniffer/Standards/AbstractScopeSniff.php",
-                    "CodeSniffer/Standards/AbstractVariableSniff.php",
-                    "CodeSniffer/Standards/IncorrectPatternException.php",
-                    "CodeSniffer/Standards/Generic/Sniffs/",
-                    "CodeSniffer/Standards/MySource/Sniffs/",
-                    "CodeSniffer/Standards/PEAR/Sniffs/",
-                    "CodeSniffer/Standards/PSR1/Sniffs/",
-                    "CodeSniffer/Standards/PSR2/Sniffs/",
-                    "CodeSniffer/Standards/Squiz/Sniffs/",
-                    "CodeSniffer/Standards/Zend/Sniffs/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Greg Sherwood",
-                    "role": "lead"
-                }
-            ],
-            "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
-            "homepage": "http://www.squizlabs.com/php-codesniffer",
-            "keywords": [
-                "phpcs",
-                "standards"
-            ],
-            "time": "2017-02-02 03:30:00"
-        },
-        {
-            "name": "symfony/yaml",
-            "version": "v3.2.2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/yaml.git",
-                "reference": "50eadbd7926e31842893c957eca362b21592a97d"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/50eadbd7926e31842893c957eca362b21592a97d",
-                "reference": "50eadbd7926e31842893c957eca362b21592a97d",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.5.9"
-            },
-            "require-dev": {
-                "symfony/console": "~2.8|~3.0"
-            },
-            "suggest": {
-                "symfony/console": "For validating YAML files using the lint command"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.2-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\Yaml\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony Yaml Component",
-            "homepage": "https://symfony.com",
-            "time": "2017-01-03 13:51:32"
-        },
-        {
-            "name": "webmozart/assert",
-            "version": "1.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^5.3.3 || ^7.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Webmozart\\Assert\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
-                }
-            ],
-            "description": "Assertions to validate method input/output with nice error messages.",
-            "keywords": [
-                "assert",
-                "check",
-                "validate"
-            ],
-            "time": "2016-11-23 20:04:58"
-        }
-    ],
-    "aliases": [],
-    "minimum-stability": "stable",
-    "stability-flags": [],
-    "prefer-stable": false,
-    "prefer-lowest": false,
-    "platform": {
-        "php": ">=7.0"
-    },
-    "platform-dev": []
-}
diff --git a/src/Exception/NullValueException.php b/src/Exception/NullValueException.php
new file mode 100644
index 0000000..2908bfd
--- /dev/null
+++ b/src/Exception/NullValueException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace DL\ConsulPhpEnvVar\Exception;
+
+
+class NullValueException extends \Exception
+{
+
+}
diff --git a/src/Service/ConsulEnvManager.php b/src/Service/ConsulEnvManager.php
index 9175a75..604b63e 100644
--- a/src/Service/ConsulEnvManager.php
+++ b/src/Service/ConsulEnvManager.php
@@ -3,7 +3,9 @@
 
 namespace DL\ConsulPhpEnvVar\Service;
 
-use SensioLabs\Consul\Services\KV;
+use DL\ConsulPhpEnvVar\Exception\NullValueException;
+use SensioLabs\Consul\Exception\ClientException;
+use SensioLabs\Consul\Services\KVInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
@@ -15,7 +17,7 @@
 class ConsulEnvManager
 {
     /**
-     * @var KV
+     * @var KVInterface
      */
     protected $kv;
 
@@ -27,10 +29,10 @@ class ConsulEnvManager
     /**
      * ConsulEnvManager constructor.
      *
-     * @param KV   $kv
+     * @param KVInterface   $kv
      * @param bool $overwriteEvenIfDefined
      */
-    public function __construct(KV $kv, bool $overwriteEvenIfDefined = false)
+    public function __construct(KVInterface $kv, bool $overwriteEvenIfDefined = false)
     {
         $this->kv                     = $kv;
         $this->overwriteEvenIfDefined = $overwriteEvenIfDefined;
@@ -40,8 +42,11 @@ public function __construct(KV $kv, bool $overwriteEvenIfDefined = false)
      * Add missing environment variables from Consul.
      *
      * @param array $mappings
+     * @param array $defaults
+     *
+     * @throws NullValueException
      */
-    public function getEnvVarsFromConsul(array $mappings)
+    public function getEnvVarsFromConsul(array $mappings, array $defaults = [])
     {
         foreach ($mappings as $environmentKey => $consulPath) {
             $keyExists = $this->keyIsDefined($environmentKey);
@@ -49,7 +54,18 @@ public function getEnvVarsFromConsul(array $mappings)
                 continue;
             }
 
-            $consulValue = $this->getKeyValueFromConsul($consulPath);
+            try {
+                $consulValue = $this->getKeyValueFromConsul($consulPath);
+            } catch(ClientException $e) {
+                if ($e->getCode() !== 404 || !isset($defaults[$environmentKey])) {
+                    throw new NullValueException(
+                        sprintf('Impossible to find value for key %s in consul or as default value.', $environmentKey),
+                        0,
+                        $e
+                    );
+                }
+                $consulValue = $defaults[$environmentKey];
+            }
             $this->saveKeyValueInEnvironmentVars($environmentKey, $consulValue);
         }
     }
@@ -65,7 +81,7 @@ public function getEnvVarsFromConsul(array $mappings)
     public function exposeEnvironmentIntoContainer(ContainerBuilder $container, array $mappings): ContainerBuilder
     {
         foreach ($mappings as $environmentKey => $consulPath) {
-            $container->setParameter("env({$environmentKey})", getenv($environmentKey));
+            $container->setParameter("env({$environmentKey})", $_ENV[$environmentKey] ?? null);
         }
 
         return $container;
@@ -80,13 +96,7 @@ public function exposeEnvironmentIntoContainer(ContainerBuilder $container, arra
      */
     private function keyIsDefined(string $environmentKey): bool
     {
-        $keyValue = getenv($environmentKey);
-
-        if (false === $keyValue) {
-            return false;
-        }
-
-        return true;
+        return isset($_ENV[$environmentKey]);
     }
 
     /**
@@ -109,6 +119,12 @@ private function getKeyValueFromConsul(string $kvPath): string
      */
     private function saveKeyValueInEnvironmentVars($envKey, $kvValue)
     {
-        putenv("{$envKey}={$kvValue}");
+        $notHttpName = 0 !== strpos($envKey, 'HTTP_');
+
+        putenv("$envKey=$kvValue");
+        $_ENV[$envKey] = $kvValue;
+        if ($notHttpName) {
+            $_SERVER[$envKey] = $kvValue;
+        }
     }
 }
diff --git a/tests/Service/ConsulEnvManagerTest.php b/tests/Service/ConsulEnvManagerTest.php
index 10d7056..578e442 100644
--- a/tests/Service/ConsulEnvManagerTest.php
+++ b/tests/Service/ConsulEnvManagerTest.php
@@ -6,7 +6,8 @@
 use DL\ConsulPhpEnvVar\Service\ConsulEnvManager;
 use PHPUnit\Framework\TestCase;
 use SensioLabs\Consul\ConsulResponse;
-use SensioLabs\Consul\Services\KV;
+use SensioLabs\Consul\Exception\ClientException;
+use SensioLabs\Consul\Services\KVInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
@@ -27,8 +28,7 @@ class ConsulEnvManagerTest extends TestCase
      */
     protected function setUp()
     {
-        $this->kv = $this->getMockBuilder(KV::class)
-            ->disableOriginalConstructor()
+        $this->kv = $this->getMockBuilder(KVInterface::class)
             ->getMock();
     }
 
@@ -58,6 +58,7 @@ public function testGivenThatAnEnvironmentVariableIsDefinedThenItsValueWillNotBe
             ->method('get');
 
         putenv("{$testKey}=already-defined");
+        $_ENV[$testKey] = 'already-defined';
 
         $manager = new ConsulEnvManager($this->kv);
         $manager->getEnvVarsFromConsul([
@@ -78,6 +79,7 @@ public function testGivenThatAnEnvironmentVariableIsDefinedThenItsValueWillStill
 
         $this->assertFalse(getenv($testKey));
         putenv("{$testKey}=already-defined");
+        $_ENV[$testKey] = 'already-defined';
 
         $manager = new ConsulEnvManager($this->kv, true);
         $manager->getEnvVarsFromConsul([
@@ -104,4 +106,35 @@ public function testGivenThatASetOfMappingsAreProvidedIntoTheContainerThenTheyWi
         $manager = new ConsulEnvManager($this->kv, false);
         $manager->exposeEnvironmentIntoContainer($container, $mappings);
     }
+
+    public function testItUsesDefaultValueIfKeyNotAvailableInConsul()
+    {
+        $testKey  = 'TEST_ENV_4';
+
+        $this->kv->expects($this->once())
+            ->method('get')
+            ->will($this->throwException(new ClientException('', 404)));
+
+        $manager = new ConsulEnvManager($this->kv, false);
+        $manager->getEnvVarsFromConsul([$testKey => 'test/env4'], [$testKey => 'foo']);
+
+        $this->assertEquals('foo', getenv($testKey));
+    }
+
+    /**
+     * @expectedException \DL\ConsulPhpEnvVar\Exception\NullValueException
+     */
+    public function testItThrowExceptionIfKeyNotAvailableInConsulAndNotInDefaultValues()
+    {
+        $testKey  = 'TEST_ENV_5';
+
+        $this->kv->expects($this->once())
+            ->method('get')
+            ->will($this->throwException(new ClientException('', 404)));
+
+        $manager = new ConsulEnvManager($this->kv, false);
+        $manager->getEnvVarsFromConsul([$testKey => 'test/env5']);
+
+        $this->assertEquals('foo', getenv($testKey));
+    }
 }