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density, 'thumbnail'), progressPercent: Math.round((item.watchedSeconds / item.durationSeconds) * 100), durationMinutes: Math.round(item.durationSeconds / 60) }; } private selectImageSize( images: ImageSet, density: DeviceDensity, type: ImageType ): string { const widthMap = { thumbnail: { low: 160, medium: 320, high: 480 }, banner: { low: 640, medium: 960, high: 1280 } }; return images.getUrl(widthMap[type][density]); } } // ============================================ // Client Context Layer - Device awareness // ============================================ interface ClientContext { deviceType: 'mobile' | 'tablet' | 'web' | 'tv'; deviceDensity: 'low' | 'medium' | 'high'; locale: string; region: string; appVersion: string; featureFlags: Record; abTestAssignments: Record; } function parseClientContext(headers: Headers): ClientContext { return { deviceType: parseDeviceType(headers.get('X-Device-Type')), deviceDensity: parseDeviceDensity(headers.get('X-Device-Density')), locale: headers.get('Accept-Language')?.split(',')[0] || 'en-US', region: headers.get('X-Region') || 'US', appVersion: headers.get('X-App-Version') || '1.0.0', featureFlags: parseFeatureFlags(headers.get('X-Feature-Flags')), abTestAssignments: parseABTests(headers.get('X-AB-Tests')) }; }72:T717,// Principle: Failure Isolation with Graceful Degradation interface HomeScreenData { user: UserData; continueWatching: MediaItem[]; recommendations: MediaItem[]; // Non-critical - can fail promotions: Promotion[]; // Non-critical - can fail criticalAlerts: Alert[]; // Critical - failure is serious } class ResilientHomeScreenOrchestrator { async getHomeScreen(userId: string): Promise { // Critical data: fail the request if these fail const [user, continueWatching] = await Promise.all([ this.userService.getUser(userId), this.watchHistoryService.getInProgress(userId) ]); // Non-critical data: use fallbacks on failure const [recommendations, promotions, alerts] = await Promise.allSettled([ this.recommendationService.getRecommendations(userId), this.promotionService.getActivePromotions(userId), this.alertService.getCriticalAlerts(userId) ]); return { user, continueWatching, recommendations: this.unwrapOrEmpty(recommendations), promotions: this.unwrapOrEmpty(promotions), criticalAlerts: this.unwrapOr(alerts, []) // Alerts warrant logging }; } private unwrapOrEmpty(result: PromiseSettledResult): T[] { if (result.status === 'fulfilled') { return result.value; } // Silent failure for non-critical data this.metrics.increment('bff.graceful_degradation', { component: 'non_critical' }); return []; } private unwrapOr(result: PromiseSettledResult, fallback: T): T { if (result.status === 'fulfilled') { return result.value; } // Log errors for semi-critical data this.logger.warn('Service call failed, using fallback', { error: result.reason }); return fallback; } 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A single application might serve **native iOS and Android apps**, **responsive web applications**, **smart TV interfaces**, **wearable devices**, **voice assistants**, and **IoT devices**—each with fundamentally different capabilities, constraints, and user expectations.\n\nThis explosion of client diversity creates a profound architectural challenge: **How do you build backend APIs that serve all these clients well without becoming a maintenance nightmare?**\n\nThe Backend-for-Frontend (BFF) pattern emerged as a elegant solution to this problem—a pattern that has become a cornerstone of modern distributed systems architecture at companies like Netflix, SoundCloud, Amazon, and Spotify."},"type":"text"},{"data":{"icon":"Target","title":"What You Will Learn","content":"By the end of this page, you will understand the BFF pattern's origins, core principles, architectural placement, and the specific problems it solves. 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General-purpose APIs accumulate technical debt in insidious ways:"},"type":"text"},{"data":{"rows":[["Over-fetching","Mobile apps receive 10x more data than displayed","Poor battery life, slow perceived performance, user churn"],["Under-fetching","Single screen requires 5-15 API calls","Increased latency, complex client-side orchestration, fragile UX"],["API Evolution","Any change risks breaking some client type","Slow release velocity, defensive programming, feature stagnation"],["Team Coupling","Frontend teams wait for backend changes","Reduced autonomy, longer lead times, organizational friction"],["Response Bloat","Fields added for one client pollute all responses","Increased bandwidth costs, parsing overhead, security exposure"]],"caption":"Hidden Costs of General-Purpose APIs","headers":["Problem Domain","Manifestation","Business Impact"]},"type":"table"},{"data":{"icon":"AlertCircle","title":"The Coordination Tax","content":"Perhaps the most damaging cost is invisible: the coordination overhead. When every API change requires alignment across iOS, Android, web, and backend teams—and testing across all clients—the organization slows to a crawl. Simple features take months instead of days.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":1},{"id":"enter-bff","title":"Enter the Backend-for-Frontend","content":[{"data":{"content":"The Backend-for-Frontend pattern was first articulated by Sam Newman (author of \"Building Microservices\") in 2015, though the concept had been emerging organically at companies like SoundCloud since 2013. The pattern's core insight is elegantly simple:\n\n> **Instead of building one API for all clients, build a dedicated backend service for each client type.**\n\nEach BFF is a thin, purpose-built service that:\n- **Speaks the language of its client** — Returns responses in exactly the shape the client needs\n- **Aggregates and transforms** — Calls multiple downstream services and composes responses\n- **Is owned by the client team** — The frontend team builds and maintains their own BFF\n- **Evolves at the client's pace** — Changes don't require cross-team coordination"},"type":"text"},{"data":{"height":"450px","mermaidSyntax":"graph TB\n subgraph Clients\n A[iOS App]\n B[Android App]\n C[Web App]\n D[Smart TV]\n end\n \n subgraph BFF Layer\n E[iOS BFF]\n F[Android BFF]\n G[Web BFF]\n H[TV BFF]\n end\n \n subgraph Downstream Services\n I[User Service]\n J[Content Service]\n K[Recommendation Service]\n L[Analytics Service]\n end\n \n A --> E\n B --> F\n C --> G\n D --> H\n \n E --> I\n E --> J\n E --> K\n \n F --> I\n F --> J\n F --> K\n \n G --> I\n G --> J\n G --> K\n G --> L\n \n H --> J\n H --> K"},"type":"mermaid-excalidraw"},{"data":{"content":"### The Fundamental Insight\n\nThe BFF pattern recognizes a crucial truth: **different clients have fundamentally different needs that cannot be reconciled in a single API without compromise**. Rather than forcing compromise, BFFs embrace this reality by providing dedicated integration points.\n\nThis isn't about duplicating business logic—the core services (User, Content, Recommendations) remain centralized. BFFs are purely about **client-specific presentation and orchestration**."},"type":"text"},{"data":{"icon":"Lightbulb","title":"BFFs as Translation Layers","content":"Think of BFFs as translators between two worlds: the domain-oriented world of backend microservices (which speak in terms of business entities and operations) and the experience-oriented world of user interfaces (which speak in terms of screens, components, and user flows).","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":2},{"id":"architectural-anatomy","title":"Architectural Anatomy of a BFF","content":[{"data":{"content":"A well-designed BFF has a specific internal structure that reflects its dual role: client-facing API gateway and backend service orchestrator. Understanding this anatomy is essential for implementing BFFs correctly.\n\n### Core Components\n\nEvery BFF contains several distinct layers:"},"type":"text"},{"data":{"items":["**API Surface Layer** — Defines endpoints in client-optimal format (REST, GraphQL, or even proprietary protocols). This layer handles request parsing, authentication passthrough, and response serialization.","**Orchestration Layer** — Contains the logic for calling multiple downstream services, handling partial failures, and assembling composite responses. This is where the 'aggregation' magic happens.","**Transformation Layer** — Maps between downstream service response formats and client-optimal formats. Handles field renaming, unit conversion, locale-specific formatting, and data enrichment.","**Client Context Layer** — Manages client-specific concerns like device capabilities, feature flags, A/B test assignments, and progressive disclosure of features."],"title":{"icon":"Target","text":"BFF Architectural Layers","type":"icon","color":"primary","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"fileName":"bff-architecture.ts","languages":[{"code":"$71","label":"TypeScript","value":"typescript"}],"showLineNumbers":true},"type":"code"}],"titleType":"number","titleNumber":3},{"id":"bff-vs-api-gateway","title":"BFF vs API Gateway: Critical Distinctions","content":[{"data":{"content":"A common source of confusion is the relationship between BFFs and API Gateways. While they operate in similar architectural positions, they serve fundamentally different purposes and embody different design philosophies.\n\n### Conceptual Comparison"},"type":"text"},{"data":{"rows":[["Primary Purpose","Cross-cutting concerns: auth, rate limiting, routing","Client-specific API adaptation and orchestration"],["Scope","All clients, all services","One specific client type"],["Ownership","Platform/infrastructure team","Client team (frontend)"],["Business Logic","Zero business logic (by design)","Contains presentation logic"],["Response Transformation","Minimal (header manipulation)","Extensive (response composition)"],["Coupling","Loosely coupled to clients","Intentionally coupled to one client"],["Cardinality","Typically one gateway","One per client type (multiple)"],["Evolution Pace","Slow, coordinated changes","Rapid, independent deployment"]],"caption":"BFF vs API Gateway: Key Differences","headers":["Dimension","API Gateway","Backend-for-Frontend"]},"type":"table"},{"data":{"content":"### BFFs Sit Behind Gateways\n\nIn most architectures, BFFs and API Gateways coexist—they're not alternatives. The typical production topology looks like this:"},"type":"text"},{"data":{"height":"350px","mermaidSyntax":"graph LR\n subgraph Edge\n A[Mobile Client]\n B[Web Client]\n end\n \n subgraph \"API Gateway Layer\"\n C[API Gateway]\n end\n \n subgraph \"BFF Layer\"\n D[Mobile BFF]\n E[Web BFF]\n end\n \n subgraph \"Microservices\"\n F[Service A]\n G[Service B]\n H[Service C]\n end\n \n A --> C\n B --> C\n C -->|/mobile/*| D\n C -->|/web/*| E\n D --> F\n D --> G\n E --> F\n E --> H"},"type":"mermaid-excalidraw"},{"data":{"content":"The API Gateway handles **infrastructure concerns**:\n- TLS termination\n- Authentication/authorization verification\n- Rate limiting\n- Request routing to appropriate BFF\n- Observability (metrics, tracing)\n\nThe BFF handles **client concerns**:\n- Response composition from multiple services\n- Data transformation for client needs\n- Client-specific error handling\n- Feature flag interpretation\n- Device-appropriate data selection"},"type":"text"},{"data":{"icon":"Info","title":"The Separation Principle","content":"A well-designed API Gateway should be completely unaware of what's behind it—whether BFFs, direct services, or anything else. Similarly, a BFF should assume all cross-cutting concerns are handled before requests reach it. This separation enables independent evolution of both layers.","variant":"note"},"type":"callout"}],"titleType":"number","titleNumber":4},{"id":"when-to-use-bff","title":"When to Use the BFF Pattern","content":[{"data":{"content":"The BFF pattern is powerful, but it's not universally applicable. Understanding when it provides value versus when it adds unnecessary complexity is crucial for architectural decision-making.\n\n### Strong Indicators for BFF Adoption"},"type":"text"},{"data":{"left":[{"data":{"items":["Multiple client types with genuinely different UI needs","Frontend teams are blocked waiting for backend API changes","Significant over-fetching or under-fetching problems","Need to aggregate data from many microservices per screen","Client teams have the capacity to own a backend service","Microservices return domain-oriented (not UX-oriented) responses","Different clients need different API protocols"],"title":{"icon":"CheckCircle","text":"BFF Is a Good Fit When","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"right":[{"data":{"items":["Single client type (web-only application)","Simple CRUD operations with minimal aggregation","Small engineering team without capacity for additional services","Backend APIs already designed with client needs in mind","GraphQL already provides needed flexibility","Monolith architecture without microservices complexity","Minimal difference between client requirements"],"title":{"icon":"XCircle","text":"BFF May Be Overkill When","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"accent"},"type":"list"}]},"type":"two-column"},{"data":{"content":"### The Client Diversity Threshold\n\nA useful heuristic: **consider BFF when client-specific code in your general API exceeds 20-30% of the codebase**. This threshold indicates that client needs have diverged enough that separation would reduce overall complexity.\n\n### Team Structure Alignment\n\nBFFs naturally align with Conway's Law. Organizations with distinct mobile, web, and TV teams often find BFFs emerging organically—each team naturally wants control over their integration layer. Conversely, organizations with full-stack 'feature teams' may find less need for formal BFF separation.\n\nThe pattern also works well with the 'two-pizza team' model: a BFF should be fully owned and operated by a team small enough that two pizzas can feed them. If your BFF requires cross-team coordination, you've likely either combined BFFs that should be separate, or the BFF has grown beyond its intended scope."},"type":"text"},{"data":{"icon":"AlertCircle","title":"Avoid Shared BFFs","content":"The anti-pattern of a 'shared BFF' that serves multiple clients defeats the pattern's entire purpose. If you find yourself debating what to include in a BFF because of different clients' needs, you need multiple BFFs. A BFF serving iOS and Android might make sense if both use identical APIs; a BFF serving web and mobile almost never does.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":5},{"id":"bff-design-principles","title":"BFF Design Principles","content":[{"data":{"content":"Effective BFF implementation requires adherence to several design principles that distinguish a well-architected BFF from a poorly designed one. These principles ensure BFFs remain maintainable, performant, and true to their purpose."},"type":"text"},{"data":{"type":"ordered","items":["**Single Client Ownership** — Each BFF serves exactly one client type and is owned by that client's team. This ensures changes are made with deep understanding of client needs and don't require cross-team coordination.","**No Business Logic** — BFFs contain orchestration, transformation, and presentation logic, but never business logic. Business rules live in downstream domain services. A BFF should never be the source of truth for business decisions.","**Thin by Design** — BFFs should be as thin as possible—essentially 'smart proxies.' If a BFF grows complex, that's often a signal that business logic is leaking in or that downstream services need refactoring.","**Failure Isolation** — BFFs must handle downstream service failures gracefully. A failing recommendation service shouldn't crash the entire mobile app home screen. Design for graceful degradation.","**Independent Deployability** — BFFs must deploy independently of both their clients and downstream services. This independence is the source of their value for team autonomy.","**Client-Driven Contracts** — BFF APIs are designed client-first. Start with the UI mockup, determine what data shape would be optimal, then build the BFF to produce that shape."],"title":{"icon":"Sparkles","text":"Core Design Principles","type":"icon","color":"primary","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"fileName":"graceful-degradation.ts","languages":[{"code":"$72","label":"TypeScript","value":"typescript"}],"showLineNumbers":true},"type":"code"}],"titleType":"number","titleNumber":6},{"id":"real-world-origins","title":"Real-World Origins: SoundCloud's Story","content":[{"data":{"content":"The BFF pattern's emergence at SoundCloud provides valuable context for understanding its purpose and evolution. Their journey illustrates why organizations naturally arrive at this pattern when facing multi-client complexity.\n\n### The Before State\n\nIn 2012, SoundCloud operated a monolithic Ruby on Rails application serving both their web and mobile clients. As they began decomposing into microservices, they initially created a single 'API Gateway' layer that:\n- Aggregated calls to multiple services\n- Transformed responses for different clients\n- Handled authentication\n- Managed caching\n\nThis seemed reasonable initially. But problems emerged rapidly."},"type":"text"},{"data":{"items":["**Release Coupling** — Any change to the shared API required coordination between iOS, Android, and web teams. Simple features took weeks to deploy.","**Compromised Responses** — The API returned 'negotiated' responses that were suboptimal for everyone. Mobile received unused fields; web received under-detailed data.","**Ownership Vacuum** — No single team owned the API layer. It became a no-man's-land where technical debt accumulated because 'it wasn't anyone's responsibility.'","**Conflicting Requirements** — Teams constantly debated response format changes, with each client team advocating for their needs. Resolution was slow and political.","**Testing Complexity** — Every API change required testing across all clients, creating a testing matrix that grew exponentially."],"title":{"icon":"AlertCircle","text":"The Pain Points That Emerged","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"### The BFF Solution\n\nSoundCloud's solution was to split their single API layer into client-specific BFFs:\n\n- **iOS BFF** — Owned by the iOS team, deployed whenever iOS needed changes\n- **Android BFF** — Owned by the Android team, evolved with Android-specific needs \n- **Web BFF** — Owned by the web team, included web-specific aggregations\n\nThe results were transformative:\n- **Release velocity increased 3x** — Teams deployed independently\n- **API satisfaction improved** — Each client got exactly what it needed\n- **Ownership became clear** — Each team was responsible for their BFF\n- **Innovation accelerated** — Teams experimented without fear of breaking others"},"type":"text"},{"data":{"icon":"CheckCircle","title":"Industry Validation","content":"SoundCloud's public documentation of this pattern led to widespread adoption. Netflix developed 'Zuul' with BFF principles. Amazon's mobile and web teams operate independent BFFs. Spotify uses BFFs extensively for their diverse client ecosystem. The pattern proved universally applicable across different scales and domains.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":7},{"id":"summary","title":"Summary: Understanding the BFF Pattern","content":[{"data":{"content":"We've established a comprehensive foundation for understanding the Backend-for-Frontend pattern. Let's consolidate the essential concepts:"},"type":"text"},{"data":{"type":"ordered","items":["**BFF addresses multi-client complexity** — When different clients have fundamentally different needs, a single API creates unavoidable compromises. BFFs embrace client-specific requirements.","**One BFF per client type** — Each BFF is owned by its client team and evolves at that client's pace. Never share a BFF across different client types.","**BFFs contain no business logic** — They orchestrate and transform, but business rules live in downstream domain services. BFFs are presentation adapters.","**BFFs complement API Gateways** — Gateways handle cross-cutting concerns; BFFs handle client-specific concerns. They work together, not as alternatives.","**Design for failure isolation** — BFFs must gracefully handle downstream failures without cascading failures to the client.","**Team autonomy is the primary benefit** — Beyond technical advantages, BFFs fundamentally change team dynamics by eliminating cross-team dependencies."],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**What's Next:**\n\nNow that we understand what the BFF pattern is and why it exists, the next page explores **Mobile vs Web BFFs**—diving deep into the specific differences between BFFs for different client types and how to design each optimally."},"type":"text"},{"data":{"icon":"CheckCircle","title":"Page Complete","content":"You now understand the fundamental concepts, principles, and purpose of the Backend-for-Frontend pattern. You can articulate why it exists, when to apply it, and how it differs from other integration patterns. This foundation will support your understanding of more advanced BFF topics in subsequent pages.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":8}],"isLocked":false},{"id":"seed_aa19f5deb9c23433e5388ac9f14e31e9","title":"Mobile vs Web BFFs","order":1,"content":null,"isLocked":true},{"id":"seed_cb6fed8ed218d6d401ee2f0d49c0b066","title":"API Aggregation","order":2,"content":null,"isLocked":true},{"id":"seed_feaf263be409fee0846fb5db41e0e569","title":"Request Coalescing","order":3,"content":null,"isLocked":true},{"id":"seed_98574f8b1b73a293db50f7dd89bc30f5","title":"BFF Trade-offs","order":4,"content":null,"isLocked":true}]}},"dataUpdateCount":1,"dataUpdatedAt":1792199672646,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getModule"],{"input":{"slug":"backend-for-frontend"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getModule\"],{\"input\":{\"slug\":\"backend-for-frontend\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199672671,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792199672646,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getProgress"],{"input":{"moduleId":"seed_0512d81c65268e4945ccbd1cdb76fcaa"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getProgress\"],{\"input\":{\"moduleId\":\"seed_0512d81c65268e4945ccbd1cdb76fcaa\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199672671,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792199672646,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","get"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_aa19f5deb9c23433e5388ac9f14e31e9"},"type":"query"}],"queryHash":"[[\"feedback\",\"get\"],{\"input\":{\"contentId\":\"seed_aa19f5deb9c23433e5388ac9f14e31e9\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199672671,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792199672646,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","getUserLike"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_aa19f5deb9c23433e5388ac9f14e31e9"},"type":"query"}],"queryHash":"[[\"feedback\",\"getUserLike\"],{\"input\":{\"contentId\":\"seed_aa19f5deb9c23433e5388ac9f14e31e9\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199672671,"state":{"data":{"json":[]},"dataUpdateCount":1,"dataUpdatedAt":1792199672646,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["highlights","getHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_aa19f5deb9c23433e5388ac9f14e31e9"},"type":"query"}],"queryHash":"[[\"highlights\",\"getHighlights\"],{\"input\":{\"contentId\":\"seed_aa19f5deb9c23433e5388ac9f14e31e9\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792199672671,"state":{"data":"$undefined","dataUpdateCount":0,"dataUpdatedAt":0,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"pending","fetchStatus":"fetching"},"queryKey":[["highlights","getPopularHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_aa19f5deb9c23433e5388ac9f14e31e9","minCount":2},"type":"query"}],"queryHash":"[[\"highlights\",\"getPopularHighlights\"],{\"input\":{\"contentId\":\"seed_aa19f5deb9c23433e5388ac9f14e31e9\",\"contentType\":\"LEARNING_PAGE\",\"minCount\":2},\"type\":\"query\"}]","promise":"$@73"}]},"children":"$L74"}]