# Api Gateway
**Source:** https://glossary.keenfunnel.com/terms/api-gateway
**Language:** German

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## Technische Erklärung

A gateway can terminate TLS, authenticate clients, authorise requests, apply quotas and rate limits, transform messages, route by version or path, cache responses, aggregate services, and emit telemetry. It provides a managed entry point while hiding internal service topology.

## Geschäftliche Relevanz

API gateways centralise cross-cutting controls, simplify client integration, and protect backend services. They support consistent policy enforcement and operational visibility across many APIs.

## Implementierungsbeispiel

A company places a gateway before payment and account services to validate tokens, enforce per-client quotas, route versions, redact sensitive logs, and monitor latency and errors.

## Einschränkungen und häufige Missverständnisse

A gateway can become a bottleneck or high-impact failure point. Excessive logic at the gateway increases coupling, and it does not replace secure backend design, service identity, or API lifecycle governance.

## Themen

Systemarchitektur Cybersicherheit

## Quellen

AWS — API Management — OWASP API Security — https://owasp.org/www-project-api-security/

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