Design Patterns MCP Server

{ "id": "api-gateway", "name": "API Gateway", "category": "Microservices", "description": "Single entry point for all clients providing routing, composition, and protocol translation", "when_to_use": "Multiple microservices\nClient simplification\nCross-cutting concerns", "benefits": "Single entry point\nRequest routing\nProtocol translation\nCross-cutting concerns", "drawbacks": "Single point of failure\nPerformance bottleneck\nDevelopment bottleneck", "use_cases": "Mobile backends\nWeb applications\nThird-party integrations", "complexity": "Medium", "tags": [ "microservices", "communication", "gateway" ], "examples": { "typescript": { "language": "typescript", "code": "// API Gateway: single entry point for microservices\nclass ApiGateway {\n private services = new Map<string, string>();\n \n registerService(name: string, url: string) {\n this.services.set(name, url);\n }\n \n async route(request: Request): Promise<Response> {\n const [, service, ...path] = new URL(request.url).pathname.split('/');\n const serviceUrl = this.services.get(service);\n \n if (!serviceUrl) {\n return new Response('Service not found', { status: 404 });\n }\n \n if (!this.authenticate(request)) {\n return new Response('Unauthorized', { status: 401 });\n }\n \n return fetch(serviceUrl + '/' + path.join('/'), {\n method: request.method,\n headers: request.headers\n });\n }\n \n private authenticate(req: Request): boolean {\n return !!req.headers.get('Authorization');\n }\n}\n\nconst gateway = new ApiGateway();\ngateway.registerService('users', 'http://users:3000');" } } }