Gateway Domain-Centric Routing (GDCR) Version 4. 0 - Javascript The Maverick Ghost Edition v15. 1 This paper introduces a practical solution to API sprawl: routing requests by business domain (Sales, Finance, Logistics) instead of multiplying proxies for every backend system. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ THE PROBLEM Most enterprises face the same pattern: 40 backends → 40 API proxies → 40 integration packages → fragmented credentials. We've all been there. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ THE SOLUTION GDCR uses metadata-driven routing with two patterns: • DCRP (Domain-Centric Routing Pattern): Consolidates gateway proxies • PDCP (Package Domain-Centric Pattern): Consolidates backend packages Instead of creating a new proxy for each system, you route via metadata: POST /sales/orders/create/salesforceGET /finance/invoices/read/quickbooks The gateway reads domain metadata and routes dynamically. No code changes, no redeployments. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHAT CHANGED FROM JavaScript - V14. 2 TO V15. 1 V14. 2 (Feb 2026) validated the concept with 33, 000+ API calls in a sandbox. The code worked but had performance bottlenecks—linear search through metadata, slower string comparisons, and no case handling for URLs. V15. 1 fixes those issues: • Binary Search O (log n): Replaced linear scan for 20× faster metadata lookups • Zero-allocation string operations: No memory churn during routing • Case-insensitive routing: Handles /Create, /create, /CREATE identically • Observability: New headers like x-dcrp-latency and x-dcrp-version Performance leap: • Gateway engine latency dropped from 25–35ms to 15–26ms (~40% faster) • Metadata scan: 8–12ms → 0. 6ms for 500 entries • Cache hit rate improved from 90% to 95% ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHAT WE VALIDATED (SANDBOX RESULTS) Infrastructure Consolidation: • API proxies: 41 → 4 (90% reduction) • Integration packages: 39 → 4 (90% reduction) • Technical users: 39 → 12 (69% reduction) • Deployment time: 273 min → 14. 5 min (95% faster) Technical Metrics (V14. 2 Baseline): • 33, 000+ messages tested • 100% success rate, zero timeouts • 68ms average latency ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ORGANIZATIONAL IMPACT (QUALITATIVE v15. 1 improvements are projected based on benchmark tests showing ~40% latency reduction through binary search O (log n) and zero-allocation string operations. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ TECHNICAL HIGHLIGHTS Action Normalization: Maps 241 HTTP verb variants (createOrder, addItem, insertRecord. . . ) to 15 canonical codes (c, r, u, d, s, p, a, n, q, v, t, e, m, x, b). This keeps the metadata store clean. URL Fakery: Clients see /sales/orders/create/salesforce. They never see backend IPs, ports, or environment details. Security by abstraction. Binary Search O (log n): V15. 1 sorts metadata keys and uses binary search. For 500 entries, lookup dropped from 12ms to 0. 6ms. Naming Rules (New in V15. 1): Lowercase-only keys (ensures binary search consistency) Canonical action codes only (prevents duplicates) Immutable iFlow IDs (audit trail integrity) Semantic key construction (dcrpentityactionvendoridXX) CI/CD checks enforce these rules at build time. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHERE THIS WORKS Validated: SAP BTP Integration Suite (sandbox environment, 33k+ calls) Theoretical (Vendor-Agnostic): • Google Apigee • Kong Gateway • AWS API Gateway • Azure API Management • MuleSoft Anypoint • Any API Management and orchestration services The pattern is vendor-agnostic—same concept, different implementation details. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ USE CASES Vendor lock-in escape: Switch from SAP to Apigee without rewriting client apps AI-ready routing: LLMs understand "sales/orders" better than "sap-p03-prod-endpoint-7b" Zero-code deployment: Add new routes via metadata updates (no gateway redeployment) Multi-cloud orchestration: Unified API layer across AWS, Azure, GCP ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ RELATED WORK Blog Posts: • Medium: Gateway Domain-
RICARDO VIANA (Tue,) studied this question.