fix: 修改中间件接口描述，更新通用的401判断

src/Application.php

@@ -244,6 +244,13 @@ class Application implements ClientInterface
             throw new ApplicationException("SDK Upstream Failed", $request, []);
         }
 
+        if ($response->getStatusCode() == 401) {
+            if ($this->logger) {
+                $this->logger->error("sdk error, auth fail", $context);
+            }
+            throw new ApplicationException("auth Failed", $request, []);
+        }
+
         try {
             $rpcResult = $this->option->handlingPolicy()->process($response);
         } catch (GuiltyResultException $exception) {

src/Middleware/MiddlewareInterface.php

@@ -5,5 +5,9 @@ namespace Jiwei\EasyHttpSdk\Middleware;
 
 interface MiddlewareInterface
 {
-
+    /**
+     * @param callable $handler
+     * @return callable
+     */
+    public function __invoke(callable $handler): callable;
 }