[Server] Change visibility of StreamableHttpTransport methods to protected

[lvluoyue]

hi, I am integrating this SDK with webman framework. When using ClientGateway to send logs, I noticed that the messages are being output to the console, because webman framework starts multiple processes through the console and creates httpserver via socket, so it outputs to the console. Now I need to extend StreamableHttpTransport to send the results to the stream instead.

Breaking Changes

No breaking changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[lvluoyue]

<?php

use \Mcp\Server\Transport\StreamableHttpTransport as BaseStreamableHttpTransport;
use Psr\Http\Message\ResponseFactoryInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\StreamFactoryInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use Symfony\Component\Uid\Uuid;
use Workerman\Connection\TcpConnection;
use Workerman\Protocols\Http\ServerSentEvents;

class StreamableHttpTransport extends BaseStreamableHttpTransport
{

    private readonly TcpConnection $connection;

    /**
     * @param array<string, string> $corsHeaders
     */
    public function __construct(
        private readonly ServerRequestInterface $request,
        ?ResponseFactoryInterface $responseFactory = null,
        ?StreamFactoryInterface $streamFactory = null,
        array $corsHeaders = [],
        LoggerInterface $logger = new NullLogger(),
    ) {
        $this->connection = $request->getAttribute(TcpConnection::class);
        parent::__construct($request, $responseFactory, $streamFactory, $corsHeaders, $logger);
    }

    protected function handleFiberTermination(): void
    {
        $finalResult = $this->sessionFiber->getReturn();

        if (null !== $finalResult) {
            try {
                $encoded = json_encode($finalResult, \JSON_THROW_ON_ERROR);
                $this->connection->send(new ServerSentEvents([
                    'event' => 'message',
                    'data' => $encoded,
                ]));
            } catch (\JsonException $e) {
                $this->logger->error('SSE: Failed to encode final Fiber result.', ['exception' => $e]);
            }
        }

        $this->sessionFiber = null;
    }

    protected function flushOutgoingMessages(?Uuid $sessionId): void
    {
        $messages = $this->getOutgoingMessages($sessionId);

        foreach ($messages as $message) {
            $this->connection->send(new ServerSentEvents([
                'event' => 'message',
                'data' => $message['message'],
            ]));
        }
    }

}

[chr-hertel]

Thanks @lvluoyue