Module server Future

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Server Module - Future Enhancements

Scope

• Protocol and API runtime hardening for HTTP/1.1, HTTP/2, HTTP/3, WebSocket, MQTT, gRPC, and GraphQL.
• Routing, auth, validation, and gateway resilience improvements for production clusters.
• Operational hardening for long-running server processes under mixed workloads.

Design Constraints

• All new endpoint paths must pass routing-layer authorization before handler dispatch — enforced via AuthMiddleware::authorize(...) gate in all privileged route registrations; validated by SCH-01..SCH-20 in tests/server/test_server_contract_hardening_focused.cpp (Target: Q2 2026 → Completed Q3 2026)
• OpenAPI and JSON-schema validation must remain source-driven from handler contracts (Target: Q4 2026)
• gRPC and REST compatibility rules must remain additive in active major versions (Target: ongoing)
• Protocol fallback logic must remain deterministic under transient dependency failures (Target: Q4 2026)
• Security and observability defaults must remain fail-closed in production mode (Target: ongoing)

Required Interfaces

Interface	Consumer	Notes
HTTPServer::routeRequest(...)	all HTTP endpoint flows	must enforce auth/validation sequencing
AuthMiddleware::authorize(...)	privileged endpoint routes	policy and scope checks must be explicit
RateLimiterV2::checkRateLimit(...)	API gateway and middleware	local and distributed backends must preserve predictable denial behavior
RequestValidationMiddleware	request intake path	JSON/schema checks before business logic
DistributedGateway	cluster routing	failover, quorum, and config propagation correctness
WasmHandlerRegistry	serverless endpoint path	bounded execution policy and safe failure behavior

Implementation Notes

Security and Access Control Hardening

Priority: High Target: Q2-Q4 2026 Status: Partially Complete

Completed

• Voice API Bearer-Token JWT/OIDC Validation (#302)
  • Implements JWT signature validation using JWTValidator from JWKS
  • Validates token expiry, issuer, and audience claims
  • Supports token revocation via JTI blacklist
  • Fail-closed rejection semantics
  • Full test coverage with 12+ test cases covering all validation paths
  • Documentation with both code comments and test suite

Remaining

• Complete route inventory for privileged endpoints and verify auth gate presence before handler dispatch.
• Add regression tests for all special-case routes (early-routing blocks, admin paths, metrics/reporting paths).
• Enforce a no-sensitive-data logging contract for token, scope, and auth failure diagnostics.

Protocol Reliability Hardening

Priority: High Target: Q4 2026

• Expand HTTP/3 production tests for migration, packet loss, handshake variability, and fallback behavior.
• Improve gRPC-web proxy resilience under upstream timeout and partial-failure conditions.
• Add mixed protocol soak scenarios to validate fairness and backpressure behavior.

Gateway and Routing Hardening

Priority: Medium Target: Q4 2026

• Extend distributed gateway failover tests (leader churn, quorum loss, partition/rejoin).
• Expand smart-routing validation for skewed latency profiles and cache-hit prediction drift.
• Harden request-coalescing fairness and timeout fallback under high duplicate load.

Serverless and Extensibility Hardening

Priority: Medium Target: Q1 2027

• Introduce stricter CPU/memory/runtime policy envelopes for WASM handlers.
• Add governance and signing checks for future plugin-based adapter loading.
• Define deactivation and rollback semantics for failed dynamic extension updates.

Test Strategy

• Route-level security regression suite for privileged and early-routing endpoints.
• Fault-injection tests for distributed rate limiting, gateway quorum loss, and upstream dependency timeouts.
• Protocol soak matrix (HTTP, HTTP/3, gRPC-web, WebSocket, MQTT) with sustained load and recovery validation.
• Contract drift checks for OpenAPI/gRPC compatibility against source handlers and proto schemas.

Performance Targets

• Maintain p99 request latency envelopes under mixed-protocol workload profiles.
• Maintain throughput stability within agreed release regression budgets.
• Keep auth/validation middleware overhead bounded under high concurrency.

Security / Reliability

• Fail closed on invalid auth context and malformed security-sensitive request state.
• Never process privileged operations before explicit access check completion.
• Keep auditability of routing and auth decisions while avoiding sensitive value leakage.

Risk Backlog

Risk 1: Privileged route drift

Severity: High Signal: New or refactored routes bypass standardized auth gate sequencing. Mitigation: Route inventory checks plus regression tests in CI.

Risk 2: Distributed limiter consistency gaps

Severity: Medium Signal: Cross-node state lag causes inconsistent deny/allow behavior. Mitigation: deterministic fallback policies and fault-injection tests.

Risk 3: HTTP/3 operational variance

Severity: Medium Signal: Increased tail latency under migration/loss scenarios. Mitigation: expanded transport soak and tuning profiles.

Adoption Scenarios

Scenario A: Security-hardening-first release lane

• Prioritize route-level auth verification and sensitive logging elimination.
• Block release if privileged route coverage is incomplete.

Scenario B: Protocol-reliability-first release lane

• Prioritize HTTP/3/gRPC-web operational hardening and recovery behavior.
• Promote only after soak and fault-injection pass criteria are met.

Scenario C: Extensibility-first release lane

• Prioritize plugin/WASM governance controls and rollback semantics.
• Promote only with signed-extension policy and runtime safety gates.

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