diff --git a/src/Classes/Api/V1/HttpRequest.php b/src/Classes/Api/V1/HttpRequest.php
index 8717da65..a525a144 100644
--- a/src/Classes/Api/V1/HttpRequest.php
+++ b/src/Classes/Api/V1/HttpRequest.php
@@ -13,6 +13,7 @@
 
 namespace RobinTheHood\ModifiedModuleLoaderClient\Api\V1;
 
+use RuntimeException;
 use RobinTheHood\ModifiedModuleLoaderClient\Logger\LogLevel;
 use RobinTheHood\ModifiedModuleLoaderClient\Logger\StaticLogger;
 
@@ -27,7 +28,107 @@ public function isServerAvailable(string $url): bool
         return false;
     }
 
-    public function sendPostRequest(string $url, $data)
+    public function sendPostRequest(string $url, $data): string
+    {
+        $result = $this->sendCurlPostRequest($url, $data);
+        return $result;
+    }
+
+
+    public function sendGetRequest(string $url): string
+    {
+        $result = $this->sendCurlGetRequest($url);
+        return $result;
+    }
+
+    public static function createQuery(array $queryValues): string
+    {
+        $query = '';
+        foreach ($queryValues as $name => $value) {
+            $query .= $name . '=' . urlencode($value) . '&';
+        }
+        return $query;
+    }
+
+    /**
+     * @throws RuntimeException
+     */
+    private function sendCurlGetRequest(string $url): string
+    {
+        // HTTP GET-Request konfigurieren
+        $curl = curl_init($url);
+        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($curl, CURLOPT_USERAGENT, 'Modified Module Loader Client');
+
+        StaticLogger::log(
+            LogLevel::DEBUG,
+            "Send GET request to $url"
+        );
+
+        // Request senden und Ergebnis erhalten
+        $result = curl_exec($curl);
+
+        // HTTP-Statuscode und Fehler prüfen
+        $httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
+        if ($result === false) {
+            $error = curl_error($curl);
+            curl_close($curl);
+            StaticLogger::log(LogLevel::ERROR, "$httpCode Error-Response from $url\n$error");
+            throw new RuntimeException('Fehler beim Senden des GET-Requests: ' . $error);
+        } elseif ($httpCode < 200 || $httpCode >= 300) {
+            curl_close($curl);
+            StaticLogger::log(LogLevel::ERROR, "$httpCode Error-Response from $url");
+            throw new RuntimeException('Fehler beim Senden des GET-Requests: HTTP-Statuscode ' . $httpCode);
+        }
+
+        // Request beenden
+        curl_close($curl);
+
+        StaticLogger::log(LogLevel::DEBUG, "$httpCode Response from $url\n" . print_r($result, true));
+
+        return (string) $result;
+    }
+
+    /**
+     * @throws RuntimeException
+     */
+    private function sendCurlPostRequest(string $url, $data): string
+    {
+        // HTTP POST-Request konfigurieren
+        $curl = curl_init($url);
+        curl_setopt($curl, CURLOPT_POST, 1);
+        curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));
+        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($curl, CURLOPT_USERAGENT, 'Modified Module Loader Client');
+
+        StaticLogger::log(
+            LogLevel::DEBUG,
+            "Send POST request to $url\n[DATA]\n" . print_r($data, true)
+        );
+
+        // Request senden und Ergebnis erhalten
+        $result = curl_exec($curl);
+
+        // HTTP-Statuscode und Fehler prüfen
+        $httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
+        if ($result === false) {
+            $error = curl_error($curl);
+            curl_close($curl);
+            StaticLogger::log(LogLevel::ERROR, "$httpCode Error-Response from $url\n$error");
+            throw new RuntimeException('Fehler beim Senden des POST-Requests: ' . $error);
+        } elseif ($httpCode < 200 || $httpCode >= 300) {
+            curl_close($curl);
+            StaticLogger::log(LogLevel::ERROR, "$httpCode Error-Response from $url");
+            throw new RuntimeException('Fehler beim Senden des POST-Requests: HTTP-Statuscode ' . $httpCode);
+        }
+
+        // Request beenden
+        curl_close($curl);
+
+        return (string) $result;
+    }
+
+    private function sendFileGetContentsPostRequest(string $url, $data): string
     {
         // http verwenden, auch wenn die Url mit https://... beginnt
         $options = [
@@ -56,7 +157,7 @@ public function sendPostRequest(string $url, $data)
         return $result;
     }
 
-    public function sendGetRequest($url)
+    private function sendFileGetContentsGetRequest(string $url): string
     {
         // http verwenden, auch wenn die Url mit https://... beginnt
         $options = [
@@ -82,13 +183,4 @@ public function sendGetRequest($url)
 
         return $result;
     }
-
-    public static function createQuery(array $queryValues): string
-    {
-        $query = '';
-        foreach ($queryValues as $name => $value) {
-            $query .= $name . '=' . urlencode($value) . '&';
-        }
-        return $query;
-    }
 }
diff --git a/tests/unit/HttpRequestTest.php b/tests/unit/HttpRequestTest.php
new file mode 100644
index 00000000..e0c9bb5a
--- /dev/null
+++ b/tests/unit/HttpRequestTest.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of MMLC - ModifiedModuleLoaderClient.
+ *
+ * (c) Robin Wieschendorf <mail@robinwieschendorf.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace RobinTheHood\ModifiedModuleLoaderClient\Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use RobinTheHood\ModifiedModuleLoaderClient\Api\V1\HttpRequest;
+
+class HttpRequestTest extends TestCase
+{
+    public function testSendPostRequestSuccess()
+    {
+        $httpClient = new HttpRequest();
+        $response = $httpClient->sendPostRequest('https://postman-echo.com/post', ['foo' => 'bar']);
+
+        $this->assertNotNull($response);
+        $this->assertIsString($response);
+        $this->assertStringContainsString('application/x-www-form-urlencoded', $response);
+        $this->assertStringContainsString('"foo": "bar"', $response);
+    }
+
+    public function testSendPostRequestFailure()
+    {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage(
+            'Fehler beim Senden des POST-Requests: Could not resolve host: this-url-does-not-exist.com'
+        );
+
+        $httpClient = new HttpRequest();
+        $response = $httpClient->sendPostRequest('https://this-url-does-not-exist.com', []);
+        $this->assertIsString($response);
+    }
+}