Updated all dependencies and prepared for PHP 8

classes/JsonRPCTransport.php

@@ -7,7 +7,7 @@
 namespace CloudObjects\PhpMAE;
 
 use Psr\Http\Message\ResponseInterface;
-use Slim\Http\Response;
+use Slim\Psr7\Response;
 
 /**
  * The JsonRPCTransport writes JsonRPC output into a Slim response.
@@ -19,10 +19,11 @@ class JsonRPCTransport {
     public function reply($data) {
         if (is_a($data, ResponseInterface::class))
             $this->response = $data->withHeader('C-PhpMae-Passthru', '1');
-        else
+        else {
             $this->response = (new Response(200))
-                ->withHeader('Content-Type', 'application/json')
-                ->write($data);
+                ->withHeader('Content-Type', 'application/json');
+            $this->response->getBody()->write($data);
+        }
     }
 
     public function receive() {