feat(server): Rework transport architecture and add StreamableHttpTransport (#49)

* feat(server): Rework transport architecture and add StreamableHttpTransport

- `Server::connect()` no longer contains a processing loop.
- `TransportInterface` is updated with `setMessageHandler()` and `listen()`.
- `StdioTransport` is updated to implement the new interface.
- A new, minimal `StreamableHttpTransport` is added for stateless HTTP.

* refactor(server): use  event-driven message handling

* feat(server): Introduce a formal session management system

* fix: ensure session elements are preserved when building server (regression from #46)

* refactor: consolidate HTTP example to use shared dependencies

* feat(server): Enhance message handling with session support

- Updated `TransportInterface` to use `onMessage` for handling incoming messages with session IDs.
- Refactored `Server`, `Handler`, and transport classes to accommodate session management using `Uuid`.
- Introduced methods for creating sessions with auto-generated and specific UUIDs in `SessionFactory` and `SessionFactoryInterface`.

* feat(server): Integrate session management in message handling

- Added session support to the `Server` and `Handler` classes, allowing for session data to be managed during message processing.
- Updated `TransportInterface` to include session context in the `send` method.
- Refactored various request handlers to utilize session information, ensuring proper session handling for incoming requests.
- Introduced a file-based session store for persistent session data management

* feat: Update session builder method to use set* instead of with*

* feat: Fix test compatibility with new session management architecture

* chore: apply code style fixes

* fix: remove deprecated SSE transport and resolve PHPStan issues

examples/04-combined-registration-http/server.php

@@ -13,16 +13,24 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 chdir(__DIR__);
 
+use Laminas\HttpHandlerRunner\Emitter\SapiEmitter;
 use Mcp\CombinedHttpExample\Manual\ManualHandlers;
 use Mcp\Server;
-use Mcp\Server\Transports\HttpServerTransport;
+use Mcp\Server\Session\FileSessionStore;
+use Mcp\Server\Transport\StreamableHttpTransport;
+use Nyholm\Psr7\Factory\Psr17Factory;
+use Nyholm\Psr7Server\ServerRequestCreator;
 
-logger()->info('Starting MCP Combined Registration (HTTP) Server...');
+$psr17Factory = new Psr17Factory();
+$creator = new ServerRequestCreator($psr17Factory, $psr17Factory, $psr17Factory, $psr17Factory);
 
-Server::make()
+$request = $creator->fromGlobals();
+
+$server = Server::make()
     ->setServerInfo('Combined HTTP Server', '1.0.0')
     ->setLogger(logger())
     ->setContainer(container())
+    ->setSession(new FileSessionStore(__DIR__.'/sessions'))
     ->setDiscovery(__DIR__, ['.'])
     ->addTool([ManualHandlers::class, 'manualGreeter'])
     ->addResource(
@@ -30,7 +38,12 @@ Server::make()
         'config://priority',
         'priority_config_manual',
     )
-    ->build()
-    ->connect(new HttpServerTransport('127.0.0.1', 8081, 'mcp_combined'));
+    ->build();
 
-logger()->info('Server listener stopped gracefully.');
+$transport = new StreamableHttpTransport($request, $psr17Factory, $psr17Factory);
+
+$server->connect($transport);
+
+$response = $transport->listen();
+
+(new SapiEmitter())->emit($response);