Overview
Direct Answer
A reverse proxy is an intermediary server positioned between clients and backend application servers that intercepts incoming requests and distributes them to appropriate upstream servers. Unlike a forward proxy, which shields clients, a reverse proxy shields and manages backend infrastructure.
How It Works
Client requests arrive at the reverse proxy's public address; the proxy then forwards these requests to one or more backend servers based on configured routing rules, load-balancing algorithms, or content inspection. The proxy collects responses from backend servers and returns them to clients, often caching content or modifying headers transparently.
Why It Matters
Organisations deploy reverse proxies to achieve load distribution across multiple servers, improve application resilience through failover mechanisms, reduce backend server exposure to external threats, and accelerate content delivery via caching. This architecture enables horizontal scaling and simplifies SSL/TLS termination at the network edge.
Common Applications
Reverse proxies serve as API gateways routing requests to microservices, distribute web traffic across clustered application servers, protect internal systems in e-commerce and SaaS platforms, and manage request routing in content delivery networks. Common deployment scenarios include multi-region failover and session persistence for stateful applications.
Key Considerations
Reverse proxies introduce a single point of failure if not configured redundantly and require careful tuning of timeouts and connection pooling to avoid backend exhaustion. Practitioners must balance performance gains against added latency and complexity in monitoring distributed request paths.
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