Add rpc error handler

Author: stelin

src/Exception/Handler/HttpErrorHandler.php

@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+
+
+namespace Swoft\Http\Server\Exception\Handler;
+
+/**
+ * Class HttpErrorHandler
+ *
+ * @since 2.0
+ */
+abstract class HttpErrorHandler extends AbstractHttpErrorHandler
+{
+
+}