Add deprecated Server alias for new HttpServer class to ensure BC

src/Server.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace React\Http;
+
+// Deprecated `Server` is an alias for new `HttpServer` to ensure existing code continues to work as-is.
+\class_alias(__NAMESPACE__ . '\\HttpServer', __NAMESPACE__ . '\\Server', true);
+
+// Aid static analysis and IDE autocompletion about this deprecation,
+// but don't actually execute during runtime because `HttpServer` is final.
+if (!\class_exists(__NAMESPACE__ . '\\Server', false)) {
+    /**
+     * @deprecated 1.5.0 See HttpServer instead
+     * @see HttpServer
+     */
+    final class Server extends HttpServer
+    {
+    }
+}

tests/ServerTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace React\Tests\Http;
+
+use React\Http\Server;
+
+class ServerTest extends TestCase
+{
+    public function testDeprecatedServerIsInstanceOfNewHttpServer()
+    {
+        $http = new Server(function () { });
+
+        $this->assertInstanceOf('React\Http\HttpServer', $http);
+    }
+}