diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index ada98fe..84fa208 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index 78c4e93..d8f1b35 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 0fb4782..3bc93d7 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/psalm.yml b/.github/workflows/psalm.yml
index 65e638c..7a32c00 100644
--- a/.github/workflows/psalm.yml
+++ b/.github/workflows/psalm.yml
@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/composer.json b/composer.json
index 1aba18f..b40e6f4 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         }
     ],
     "require": {
-        "php": "^7.4|^8.0",
+        "php": "^8.0",
         "antidot-fw/framework": "^0.2.0",
         "beberlei/assert": "^3.3",
         "drift/server": "^0.1.20",
diff --git a/docs/README.md b/docs/README.md
index a891c68..bbfb9fb 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -100,6 +100,8 @@ It allows executing promises inside PSR-15 and PSR-7 Middlewares and request han
 
 ### PSR-15 Middleware
 
+**Promise Based**
+
 ```php
 <?php
 declare(strict_types = 1);
@@ -111,6 +113,7 @@ use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\MiddlewareInterface;
 use Psr\Http\Server\RequestHandlerInterface;
+use function React\Promise\resolve;
 
 class SomeMiddleware implements MiddlewareInterface
 {
@@ -118,7 +121,7 @@ class SomeMiddleware implements MiddlewareInterface
     {
         return new PromiseResponse(
             resolve($request)
-                ->then(static fn(ServerrequestInsterface $request) => $handler->handle($request))
+                ->then(static fn(ServerRequestInterface $request) => $handler->handle($request))
         );
     }
 }
@@ -126,6 +129,8 @@ class SomeMiddleware implements MiddlewareInterface
 
 ### PSR-7 Request Handler
 
+**Promise Based**
+
 ```php
 <?php
 declare(strict_types = 1);
@@ -136,16 +141,47 @@ use Antidot\React\PromiseResponse;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;
+use function React\Promise\resolve;
 
-class SomeMiddleware implements RequestHandlerInterface
+class SomeRequestHandler implements RequestHandlerInterface
 {
-    public function process(ServerRequestInterface $request): ResponseInterface
+    public function handle(ServerRequestInterface $request): ResponseInterface
     {
-        return resolve($request)->then(
-            function(ServerrequestInterface $request): ResponseInterface {
+        return new PromiseResponse(resolve($request)->then(
+            function(ServerRequestInterface $request): ResponseInterface {
                 return new Response('Hello World!!!');
             }
-        );;
+        ));
+    }
+}
+```
+
+**Coroutine based**
+
+```php
+<?php
+declare(strict_types = 1);
+
+namespace App;
+
+use Antidot\React\PromiseResponse;
+use Generator;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use function React\Promise\resolve;
+
+class SomeRequestHandler implements RequestHandlerInterface
+{
+    public function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        return PromiseResponse::fromGeneratorCallback(
+            function(ServerRequestInterface $request): Generator {
+                $message = yield resolve('Hello World!!!');
+            
+                return new Response($message);
+            }
+        ));
     }
 }
 ```
diff --git a/src/DriftKernelAdapter.php b/src/DriftKernelAdapter.php
index b7b99f0..b81c0c8 100644
--- a/src/DriftKernelAdapter.php
+++ b/src/DriftKernelAdapter.php
@@ -68,17 +68,18 @@ public static function create(
         }
 
         return resolve(new self($serverContext, $mimeTypeChecker, $rootPath, $filesystem))
-            ->then(fn (KernelAdapter $adapter): KernelAdapter => $adapter);
+            ->then(static fn(KernelAdapter $adapter): KernelAdapter => $adapter);
     }
 
     /**
-     * @psalm-suppress LessSpecificImplementedReturnType
      * @param ServerRequestInterface $request
-     * @return PromiseResponse
+     * @psalm-suppress LessSpecificImplementedReturnType
      */
-    public function handle(ServerRequestInterface $request): PromiseResponse
+    public function handle(ServerRequestInterface $request): PromiseInterface
     {
-        return $this->application->handle($request);
+        return $this->application
+            ->handle($request)
+            ->then([ResolveGenerator::class, 'toResponse']);
     }
 
     public static function getStaticFolder(): ?string
diff --git a/src/MiddlewarePipeline.php b/src/MiddlewarePipeline.php
index 5ba31ca..1620e68 100644
--- a/src/MiddlewarePipeline.php
+++ b/src/MiddlewarePipeline.php
@@ -13,7 +13,6 @@
 use Psr\Http\Server\MiddlewareInterface;
 use Psr\Http\Server\RequestHandlerInterface;
 use Ramsey\Uuid\Uuid;
-use SplQueue;
 use Throwable;
 use function React\Promise\reject;
 use function React\Promise\resolve;
@@ -53,7 +52,6 @@ function (ServerRequestInterface $request) {
                 /** @var string $requestId */
                 $requestId = $request->getAttribute('request_id');
                 try {
-                    /** @var MiddlewareInterface $middleware */
                     $middleware = $this->concurrentPipelines[$requestId]->dequeue();
 
                     $response = $middleware->process($request, $this);
@@ -84,7 +82,6 @@ public function process(ServerRequestInterface $request, RequestHandlerInterface
                 /** @var string $requestId */
                 $requestId = $request->getAttribute('request_id');
                 try {
-                    /** @var MiddlewareQueue $queue */
                     $queue = $this->concurrentPipelines[$requestId];
                     $next = new NextHandler($queue, $handler);
 
diff --git a/src/PromiseResponse.php b/src/PromiseResponse.php
index f6471e8..8602c74 100644
--- a/src/PromiseResponse.php
+++ b/src/PromiseResponse.php
@@ -4,10 +4,12 @@
 
 namespace Antidot\React;
 
+use Generator;
 use React\Promise\PromiseInterface;
 use RingCentral\Psr7\Response;
+use function React\Promise\resolve;
 
-class PromiseResponse extends Response implements PromiseInterface
+final class PromiseResponse extends Response implements PromiseInterface
 {
     private PromiseInterface $promise;
     protected $stream;
@@ -28,6 +30,25 @@ public function __construct(
         $this->promise = $promise;
     }
 
+    /**
+     * @param callable<Generator> $callback
+     * @return static
+     */
+    public static function fromGeneratorCallback(callable $callback): self
+    {
+        return new self(resolve(function () use ($callback): Generator {
+            /** @var Generator $generator */
+            $generator = $callback();
+
+            return $generator;
+        }));
+    }
+
+    /**
+     * @param callable|null $onFulfilled
+     * @param callable|null $onRejected
+     * @param callable|null $onProgress
+     */
     final public function then(
         callable $onFulfilled = null,
         callable $onRejected = null,
diff --git a/src/ResolveGenerator.php b/src/ResolveGenerator.php
new file mode 100644
index 0000000..cb44bec
--- /dev/null
+++ b/src/ResolveGenerator.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Antidot\React;
+
+use Generator;
+use Psr\Http\Message\ResponseInterface;
+use React\Promise\Promise;
+use React\Promise\PromiseInterface;
+use Throwable;
+
+final class ResolveGenerator
+{
+    /**
+     * @param callable<Generator>|ResponseInterface|PromiseInterface $generator
+     */
+    public static function toResponse(
+        callable|ResponseInterface|PromiseInterface $callback
+    ): PromiseInterface|ResponseInterface {
+        if (false === is_callable($callback)) {
+            return $callback;
+        }
+
+        return new Promise(
+            static function (callable $resolve, callable $reject) use ($callback): void {
+                try {
+                    /** @var Generator<PromiseInterface|ResponseInterface> $generator */
+                    $generator = $callback();
+                    while ($generator->valid()) {
+                        $item = $generator->current();
+                        if ($item instanceof PromiseInterface) {
+                            $item->then(static fn($solved) => $generator->send($solved));
+                            continue;
+                        }
+                        $generator->send($item);
+                    }
+                    $resolve($generator->getReturn());
+                } catch (Throwable $exception) {
+                    $reject($exception);
+                }
+            }
+        );
+    }
+}
diff --git a/src/RunServerCommandFactory.php b/src/RunServerCommandFactory.php
index 20c302c..c287956 100644
--- a/src/RunServerCommandFactory.php
+++ b/src/RunServerCommandFactory.php
@@ -28,13 +28,13 @@ public function __invoke(ContainerInterface $container): RunServerCommand
         $adapter = $definition->getOption('adapter');
         $adapter->setDefault(DriftKernelAdapter::class);
         $staticFolder = $definition->getOption('static-folder');
-        $staticFolder->setDefault($config['static_folder']);
+        $staticFolder->setDefault((string)$config['static_folder']);
         $workers = $definition->getOption('workers');
-        $workers->setDefault($config['workers']);
+        $workers->setDefault((string)$config['workers']);
         $concurrentRequests = $definition->getOption('concurrent-requests');
-        $concurrentRequests->setDefault($config['max_concurrency']);
+        $concurrentRequests->setDefault((string)$config['max_concurrency']);
         $bufferSize = $definition->getOption('request-body-buffer');
-        $bufferSize->setDefault($config['buffer_size']);
+        $bufferSize->setDefault((string)$config['buffer_size']);
 
         return $command;
     }
diff --git a/src/ServerFactory.php b/src/ServerFactory.php
index 3b04fe0..64bab5d 100644
--- a/src/ServerFactory.php
+++ b/src/ServerFactory.php
@@ -14,10 +14,6 @@
 use React\Http\Middleware\RequestBodyBufferMiddleware;
 use React\Http\Middleware\RequestBodyParserMiddleware;
 use React\Http\Middleware\StreamingRequestMiddleware;
-use React\Promise\PromiseInterface;
-use function PHPUnit\Framework\assertArrayHasKey;
-use function PHPUnit\Framework\assertIsInt;
-use function React\Promise\resolve;
 
 class ServerFactory
 {
@@ -42,7 +38,11 @@ public function __invoke(ContainerInterface $container): Server
             new LimitConcurrentRequestsMiddleware($config['max_concurrency']),
             new RequestBodyBufferMiddleware($config['buffer_size']),
             new RequestBodyParserMiddleware(),
-            static fn (ServerRequestInterface $request): PromiseInterface => resolve($application->handle($request))
+            static function (ServerRequestInterface $request) use ($application) {
+                return $application
+                    ->handle($request)
+                    ->then([ResolveGenerator::class, 'toResponse']);
+            }
         );
 
         return $server;
diff --git a/src/WatchServerCommandFactory.php b/src/WatchServerCommandFactory.php
index ca00ee1..0401dd9 100644
--- a/src/WatchServerCommandFactory.php
+++ b/src/WatchServerCommandFactory.php
@@ -31,11 +31,11 @@ public function __invoke(ContainerInterface $container): WatchServerCommand
         $definition->setArguments([$path]);
 
         $staticFolder = $definition->getOption('static-folder');
-        $staticFolder->setDefault($config['static_folder']);
+        $staticFolder->setDefault((string)$config['static_folder']);
         $concurrentRequests = $definition->getOption('concurrent-requests');
-        $concurrentRequests->setDefault($config['max_concurrency']);
+        $concurrentRequests->setDefault((string)$config['max_concurrency']);
         $bufferSize = $definition->getOption('request-body-buffer');
-        $bufferSize->setDefault($config['buffer_size']);
+        $bufferSize->setDefault((string)$config['buffer_size']);
 
         return $command;
     }