diff --git a/app/Http/Controllers/BendingBaseController.php b/app/Http/Controllers/BendingBaseController.php
index e43bb7cd..c12bf0ea 100644
--- a/app/Http/Controllers/BendingBaseController.php
+++ b/app/Http/Controllers/BendingBaseController.php
@@ -11,14 +11,23 @@ class BendingBaseController extends Controller
     private function api(): \Illuminate\Http\Client\PendingRequest
     {
         $baseUrl = config('services.api.base_url', 'https://api.sam.kr');
+        $internalUrl = config('services.api.internal_url');
         $token = session('api_access_token', '');
 
+        $headers = [
+            'X-API-KEY' => config('services.api.key') ?: '42Jfwc6EaRQ04GNRmLR5kzJp5UudSOzGGqjmdk1a',
+            'X-TENANT-ID' => session('selected_tenant_id', 1),
+        ];
+
+        // Docker: internal_url(nginx 컨테이너) 경유, Host 헤더로 서버 블록 라우팅
+        if ($internalUrl) {
+            $headers['Host'] = parse_url($baseUrl, PHP_URL_HOST) ?: 'api.sam.kr';
+            $baseUrl = $internalUrl;
+        }
+
         return Http::baseUrl($baseUrl)
             ->withoutVerifying()
-            ->withHeaders([
-                'X-API-KEY' => config('services.api.key') ?: '42Jfwc6EaRQ04GNRmLR5kzJp5UudSOzGGqjmdk1a',
-                'X-TENANT-ID' => session('selected_tenant_id', 1),
-            ])
+            ->withHeaders($headers)
             ->withToken($token)
             ->timeout(10);
     }
@@ -37,7 +46,6 @@ public function index(Request $request): View|\Illuminate\Http\Response
             'last_page' => $body['last_page'] ?? 1,
         ];
 
-
         $filterResponse = $this->api()->get('/api/v1/bending-items/filters');
         $filterOptions = $filterResponse->successful() ? $filterResponse->json('data', []) : [];
 
@@ -45,6 +53,7 @@ public function index(Request $request): View|\Illuminate\Http\Response
             if ($request->header('HX-Target') === 'items-table') {
                 return view('bending.base.partials.table', ['items' => $data]);
             }
+
             return response('', 200)->header('HX-Redirect', route('bending.base.index', $request->query()));
         }
 
@@ -112,13 +121,14 @@ public function store(Request $request)
             $apiMessage = $body['message'] ?? 'API 오류';
             $errorBag = ['api' => "[{$response->status()}] {$apiMessage}"];
             foreach ($apiErrors as $field => $msgs) {
-                $fieldLabel = match($field) {
+                $fieldLabel = match ($field) {
                     'code' => '코드', 'name' => '이름', 'item_sep' => '대분류',
                     'item_bending' => '분류', 'item_name' => '품명', 'material' => '재질',
                     default => $field,
                 };
-                $errorBag["api_{$field}"] = "[{$fieldLabel}] " . (is_array($msgs) ? implode(', ', $msgs) : $msgs);
+                $errorBag["api_{$field}"] = "[{$fieldLabel}] ".(is_array($msgs) ? implode(', ', $msgs) : $msgs);
             }
+
             return back()->withErrors($errorBag)->withInput();
         }
 
@@ -152,7 +162,6 @@ public function update(Request $request, int $id)
             'model_UA.in' => '인정여부는 인정 또는 비인정만 선택 가능합니다.',
         ]);
 
-
         $data = $this->prepareApiData($request);
         $response = $this->api()->put("/api/v1/bending-items/{$id}", $data);
 
@@ -240,7 +249,7 @@ private function uploadCanvasImage(int $itemId, string $dataURL): ?array
         }
 
         // 임시 파일 생성
-        $tmpPath = tempnam(sys_get_temp_dir(), 'canvas_') . '.' . $ext;
+        $tmpPath = tempnam(sys_get_temp_dir(), 'canvas_').'.'.$ext;
         file_put_contents($tmpPath, $binary);
 
         try {
diff --git a/app/Http/Controllers/BendingProductController.php b/app/Http/Controllers/BendingProductController.php
index 9268c5ab..761aaf8a 100644
--- a/app/Http/Controllers/BendingProductController.php
+++ b/app/Http/Controllers/BendingProductController.php
@@ -2,7 +2,6 @@
 
 namespace App\Http\Controllers;
 
-use Barryvdh\DomPDF\Facade\Pdf;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Http;
 use Illuminate\View\View;
@@ -18,14 +17,22 @@ class BendingProductController extends Controller
     private function api(): \Illuminate\Http\Client\PendingRequest
     {
         $baseUrl = config('services.api.base_url', 'https://api.sam.kr');
+        $internalUrl = config('services.api.internal_url');
         $token = session('api_access_token', '');
 
+        $headers = [
+            'X-API-KEY' => config('services.api.key') ?: '42Jfwc6EaRQ04GNRmLR5kzJp5UudSOzGGqjmdk1a',
+            'X-TENANT-ID' => session('selected_tenant_id', 1),
+        ];
+
+        if ($internalUrl) {
+            $headers['Host'] = parse_url($baseUrl, PHP_URL_HOST) ?: 'api.sam.kr';
+            $baseUrl = $internalUrl;
+        }
+
         return Http::baseUrl($baseUrl)
             ->withoutVerifying()
-            ->withHeaders([
-                'X-API-KEY' => config('services.api.key') ?: '42Jfwc6EaRQ04GNRmLR5kzJp5UudSOzGGqjmdk1a',
-                'X-TENANT-ID' => session('selected_tenant_id', 1),
-            ])
+            ->withHeaders($headers)
             ->withToken($token)
             ->timeout(10);
     }
@@ -51,7 +58,6 @@ public function index(Request $request, string $category = 'GUIDERAIL_MODEL'): V
             'last_page' => $body['last_page'] ?? 1,
         ];
 
-
         $filterResponse = $this->api()->get('/api/v1/guiderail-models/filters');
         $filterOptions = $filterResponse->successful() ? $filterResponse->json('data', []) : [];
 
@@ -60,6 +66,7 @@ public function index(Request $request, string $category = 'GUIDERAIL_MODEL'): V
             if ($request->header('HX-Target') === 'items-table') {
                 return view('bending.products.partials.table', ['items' => $data, 'config' => $config, 'category' => $category]);
             }
+
             // 사이드바 등 그 외 HTMX → 전체 페이지 리로드
             return response('', 200)->header('HX-Redirect', route("bending.{$config['prefix']}.index", $request->query()));
         }
@@ -155,8 +162,9 @@ public function store(Request $request, string $category = 'GUIDERAIL_MODEL')
         $apiMessage = $body['message'] ?? 'API 오류';
         $errorBag = ['api' => "[{$response->status()}] {$apiMessage}"];
         foreach ($apiErrors as $field => $msgs) {
-            $errorBag["api_{$field}"] = "[{$field}] " . (is_array($msgs) ? implode(', ', $msgs) : $msgs);
+            $errorBag["api_{$field}"] = "[{$field}] ".(is_array($msgs) ? implode(', ', $msgs) : $msgs);
         }
+
         return back()->withErrors($errorBag)->withInput();
     }
 
@@ -209,8 +217,9 @@ public function update(Request $request, int $id)
         $apiMessage = $body['message'] ?? 'API 오류';
         $errorBag = ['api' => "[{$response->status()}] {$apiMessage}"];
         foreach ($apiErrors as $field => $msgs) {
-            $errorBag["api_{$field}"] = "[{$field}] " . (is_array($msgs) ? implode(', ', $msgs) : $msgs);
+            $errorBag["api_{$field}"] = "[{$field}] ".(is_array($msgs) ? implode(', ', $msgs) : $msgs);
         }
+
         return back()->withErrors($errorBag)->withInput();
     }
 
@@ -344,7 +353,7 @@ private function uploadCanvasImage(int $itemId, string $dataURL): ?array
             return null;
         }
 
-        $tmpPath = tempnam(sys_get_temp_dir(), 'canvas_') . '.' . $ext;
+        $tmpPath = tempnam(sys_get_temp_dir(), 'canvas_').'.'.$ext;
         file_put_contents($tmpPath, $binary);
 
         try {
@@ -375,7 +384,7 @@ private function prepareApiData(Request $request): array
         if (empty($data['code'])) {
             $modelName = $data['model_name'] ?? '';
             $itemSep = $data['item_sep'] ?? '';
-            $data['code'] = trim("{$itemSep}_{$modelName}_" . date('ymd_His'));
+            $data['code'] = trim("{$itemSep}_{$modelName}_".date('ymd_His'));
         }
         if (empty($data['name'])) {
             $data['name'] = $data['model_name'] ?? $data['code'];
diff --git a/app/Http/Controllers/DocumentTemplateController.php b/app/Http/Controllers/DocumentTemplateController.php
index d38fcb24..f7f8e2e9 100644
--- a/app/Http/Controllers/DocumentTemplateController.php
+++ b/app/Http/Controllers/DocumentTemplateController.php
@@ -136,15 +136,23 @@ public function blockEdit(int $id): View
     private function getPresignedUrlFromApi(int $fileId): ?string
     {
         $baseUrl = config('services.api.base_url', 'https://api.sam.kr');
+        $internalUrl = config('services.api.internal_url');
         $apiKey = config('services.api.key');
         $token = session('api_access_token', '');
 
+        $headers = [
+            'X-API-KEY' => $apiKey,
+            'X-TENANT-ID' => session('selected_tenant_id', 1),
+        ];
+
+        if ($internalUrl) {
+            $headers['Host'] = parse_url($baseUrl, PHP_URL_HOST) ?: 'api.sam.kr';
+            $baseUrl = $internalUrl;
+        }
+
         $response = \Illuminate\Support\Facades\Http::baseUrl($baseUrl)
             ->withoutVerifying()
-            ->withHeaders([
-                'X-API-KEY' => $apiKey,
-                'X-TENANT-ID' => session('selected_tenant_id', 1),
-            ])
+            ->withHeaders($headers)
             ->withToken($token)
             ->timeout(10)
             ->get("/api/v1/files/{$fileId}/presigned-url");
@@ -155,15 +163,23 @@ private function getPresignedUrlFromApi(int $fileId): ?string
     private function getPresignedUrlByPath(string $path): ?string
     {
         $baseUrl = config('services.api.base_url', 'https://api.sam.kr');
+        $internalUrl = config('services.api.internal_url');
         $apiKey = config('services.api.key');
         $token = session('api_access_token', '');
 
+        $headers = [
+            'X-API-KEY' => $apiKey,
+            'X-TENANT-ID' => session('selected_tenant_id', 1),
+        ];
+
+        if ($internalUrl) {
+            $headers['Host'] = parse_url($baseUrl, PHP_URL_HOST) ?: 'api.sam.kr';
+            $baseUrl = $internalUrl;
+        }
+
         $response = \Illuminate\Support\Facades\Http::baseUrl($baseUrl)
             ->withoutVerifying()
-            ->withHeaders([
-                'X-API-KEY' => $apiKey,
-                'X-TENANT-ID' => session('selected_tenant_id', 1),
-            ])
+            ->withHeaders($headers)
             ->withToken($token)
             ->timeout(10)
             ->post('/api/v1/files/presigned-url-by-path', ['path' => $path]);
diff --git a/app/Http/Controllers/FileViewController.php b/app/Http/Controllers/FileViewController.php
index 1ce6fc73..1e15781a 100644
--- a/app/Http/Controllers/FileViewController.php
+++ b/app/Http/Controllers/FileViewController.php
@@ -19,15 +19,23 @@ public function show(int $id)
 
         $url = Cache::remember($cacheKey, now()->addMinutes(5), function () use ($id) {
             $baseUrl = config('services.api.base_url', 'https://api.sam.kr');
+            $internalUrl = config('services.api.internal_url');
             $apiKey = config('services.api.key');
             $token = session('api_access_token', '');
 
+            $headers = [
+                'X-API-KEY' => $apiKey,
+                'X-TENANT-ID' => session('selected_tenant_id', 1),
+            ];
+
+            if ($internalUrl) {
+                $headers['Host'] = parse_url($baseUrl, PHP_URL_HOST) ?: 'api.sam.kr';
+                $baseUrl = $internalUrl;
+            }
+
             $response = Http::baseUrl($baseUrl)
                 ->withoutVerifying()
-                ->withHeaders([
-                    'X-API-KEY' => $apiKey,
-                    'X-TENANT-ID' => session('selected_tenant_id', 1),
-                ])
+                ->withHeaders($headers)
                 ->withToken($token)
                 ->timeout(10)
                 ->get("/api/v1/files/{$id}/presigned-url");