diff --git a/bootstrap/middlewares.php b/bootstrap/middlewares.php
index f0ef4fe..9ce7e00 100644
--- a/bootstrap/middlewares.php
+++ b/bootstrap/middlewares.php
@@ -3,6 +3,8 @@
 declare(strict_types=1);
 
 use Illuminate\Foundation\Configuration\Middleware;
+use Presentation\Api\V1\Http\Middlewares\EnsureApiV1AcceptsJson;
+use Presentation\Api\V1\Http\Middlewares\SetApiV1Etag;
 use Presentation\Api\V1\Http\Middlewares\TransformApiV1Response;
 
 return function (Middleware $middleware): void {
@@ -13,7 +15,9 @@ return function (Middleware $middleware): void {
     $middleware->api(append: []);
 
     $middleware->group('api.v1', [
+        EnsureApiV1AcceptsJson::class,
         'throttle:api.v1',
+        SetApiV1Etag::class,
         TransformApiV1Response::class,
     ]);
 
diff --git a/src/Presentation/Api/V1/Http/Middlewares/EnsureApiV1AcceptsJson.php b/src/Presentation/Api/V1/Http/Middlewares/EnsureApiV1AcceptsJson.php
new file mode 100644
index 0000000..fcb5c2f
--- /dev/null
+++ b/src/Presentation/Api/V1/Http/Middlewares/EnsureApiV1AcceptsJson.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Presentation\Api\V1\Http\Middlewares;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+final class EnsureApiV1AcceptsJson
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        // * Bypass for OpenAPI YAML spec route
+        if ($request->routeIs('api.v1.openapi')) {
+            /** @var Response */
+            return $next($request);
+        }
+
+        $acceptHeader = $request->header('Accept');
+
+        if ($acceptHeader !== null && $acceptHeader !== '' && $acceptHeader !== '*/*') {
+            $acceptableTypes = $request->getAcceptableContentTypes();
+            $acceptsJson     = false;
+
+            foreach ($acceptableTypes as $type) {
+                if ($type === '*/*' || $type === 'application/*' || str_contains($type, 'json')) {
+                    $acceptsJson = true;
+
+                    break;
+                }
+            }
+
+            if (! $acceptsJson) {
+                return response()->json([
+                    'type'     => $request->schemeAndHttpHost() . '/errors/406',
+                    'title'    => 'Not Acceptable',
+                    'status'   => 406,
+                    'detail'   => 'The requested media type is not supported by this endpoint. This API only serves application/json.',
+                    'instance' => $request->getPathInfo(),
+                ], 406, ['Content-Type' => 'application/problem+json']);
+            }
+        }
+
+        $request->headers->set('Accept', 'application/json');
+
+        /** @var Response */
+        return $next($request);
+    }
+}
diff --git a/src/Presentation/Api/V1/Http/Middlewares/SetApiV1Etag.php b/src/Presentation/Api/V1/Http/Middlewares/SetApiV1Etag.php
new file mode 100644
index 0000000..82e55e6
--- /dev/null
+++ b/src/Presentation/Api/V1/Http/Middlewares/SetApiV1Etag.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Presentation\Api\V1\Http\Middlewares;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\BinaryFileResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+final class SetApiV1Etag
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        /** @var Response $response */
+        $response = $next($request);
+
+        if (! $request->isMethodCacheable() || $response->getStatusCode() !== 200) {
+            return $response;
+        }
+
+        $etag = null;
+
+        if ($response instanceof BinaryFileResponse) {
+            $path = $response->getFile()->getPathname();
+            if (file_exists($path)) {
+                $etag = '"' . hash_file('sha256', $path) . '"';
+            }
+        } else {
+            $content = $response->getContent();
+            if ($content !== false && $content !== '') {
+                $etag = '"' . hash('sha256', $content) . '"';
+            }
+        }
+
+        if ($etag === null) {
+            return $response;
+        }
+
+        $response->headers->set('ETag', $etag);
+
+        $ifNoneMatch = $request->header('If-None-Match');
+        if ($ifNoneMatch !== null && $this->matchesEtag($ifNoneMatch, $etag)) {
+            $response->setStatusCode(304);
+            $response->setContent('');
+        }
+
+        return $response;
+    }
+
+    private function matchesEtag(string $ifNoneMatch, string $etag): bool
+    {
+        $candidates = array_map('trim', explode(',', $ifNoneMatch));
+
+        foreach ($candidates as $candidate) {
+            if ($candidate === '*' || $candidate === $etag || trim($candidate, '"') === trim($etag, '"')) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}