Raindrop.io MCP Server

## 🚀 Feature: Implement HTTP SSE Transport Support ### Summary Implement full HTTP Server-Sent Events (SSE) transport support for the Raindrop MCP server following the latest Model Context Protocol specifications (2024-11-05). ### Background The current implementation only supports STDIO transport, which limits deployment options and prevents web-based integrations. The MCP specification now recommends Streamable HTTP transport as the modern standard, while maintaining backwards compatibility with legacy SSE implementations. ### Goals - [ ] Replace deprecated `SSEServerTransport` with modern `StreamableHTTPServerTransport` - [ ] Implement proper session management with unique session IDs - [ ] Add backwards compatibility support for legacy SSE clients - [ ] Create comprehensive HTTP server with multiple endpoints - [ ] Add CORS support for web client integration - [ ] Implement health monitoring and API documentation endpoints ### Technical Requirements #### 1. Modern Transport Implementation - **Primary**: Use `StreamableHTTPServerTransport` for new clients - **Fallback**: Maintain `SSEServerTransport` for legacy compatibility - **Protocol**: Support MCP Protocol version 2024-11-05 - **Format**: JSON-RPC 2.0 compliant #### 2. Session Management - Generate unique session IDs using `randomUUID()` - Track active sessions for both transport types - Implement proper session cleanup on disconnect - Support concurrent connections #### 3. HTTP Endpoints - `/mcp` - Modern Streamable HTTP transport (GET/POST/DELETE) - `/sse` - Legacy SSE connection endpoint (GET) - `/messages` - Legacy SSE message endpoint (POST) - `/health` - Health check and status monitoring - `/` - API documentation and server information #### 4. Middleware and Features - JSON request/response parsing with 50MB limit - CORS headers for cross-origin web clients - Request logging with session tracking - Error handling with proper HTTP status codes - Graceful shutdown handling ### Implementation Details #### File Structure ``` src/ ├── http-server.ts # Main HTTP server implementation ├── sse.ts # Enhanced legacy SSE server ├── test-client.ts # Test client with auto-fallback └── services/ └── mcp.service.ts # Existing MCP service (no changes) ``` #### Key Dependencies - `@modelcontextprotocol/sdk` - Latest MCP SDK - `express` - HTTP server framework - `cors` support via middleware - `uuid` for session ID generation ### Acceptance Criteria - [ ] HTTP server starts successfully on configurable port - [ ] Modern clients can connect via Streamable HTTP transport - [ ] Legacy clients can connect via SSE transport - [ ] Session management works for concurrent connections - [ ] Health endpoint returns server status and session count - [ ] API documentation endpoint provides usage information - [ ] CORS enabled for web client integration - [ ] Proper error handling and logging - [ ] MCP Inspector integration works with HTTP transport ### Testing Requirements - [ ] Unit tests for session management - [ ] Integration tests for both transport types - [ ] Test client that demonstrates auto-fallback - [ ] Load testing for concurrent connections - [ ] Health endpoint validation - [ ] CORS functionality verification ### Documentation - [ ] HTTP SSE setup guide - [ ] API reference documentation - [ ] Migration guide from STDIO to HTTP - [ ] Troubleshooting guide - [ ] Examples for different client types ### Benefits 1. **Web Integration**: Enable browser-based MCP clients 2. **Scalability**: Support multiple concurrent connections 3. **Future-Proof**: Use latest MCP transport specifications 4. **Backwards Compatible**: Existing SSE clients continue working 5. **Developer Experience**: Better tooling and debugging capabilities ### Breaking Changes ❌ **None** - This is a backwards-compatible addition. Existing STDIO transport remains unchanged. ### Related Issues - [ ] #XX - Add development scripts for HTTP server - [ ] #XX - Create VS Code tasks for HTTP development - [ ] #XX - Update documentation with HTTP transport examples --- **Priority**: High **Effort**: Medium **Impact**: High - Enables web deployment and modern MCP integrations