Reverse Proxy
A Reverse Proxy is a network intermediary that accepts client requests on behalf of one or more backend servers and manages how those requests are handled and delivered.
Definition
A reverse proxy is a server-side intermediary that stands in front of one or more origin web servers to intercept incoming client traffic, forward it to the appropriate backend, and relay responses back to clients. It abstracts the backend infrastructure, shielding server details from direct exposure and improving scalability, security, and reliability. By managing traffic flow, it can balance load across multiple servers, cache content for faster delivery, and enforce security policies. Reverse proxies are widely used in web infrastructure, CDNs, and enterprise systems to optimize performance and protect origin servers from direct attack. This intermediary role differentiates it from forward proxies, which act on behalf of clients rather than servers.
Pros
- Enhances security by hiding backend server details and mitigating direct attacks.
- Improves performance through caching and content compression.
- Enables load balancing to distribute traffic across multiple servers.
- Supports SSL/TLS offloading to reduce origin server load.
- Facilitates scalability for high-traffic applications and services.
Cons
- Introduces a single point of failure if not properly redundantly configured.
- Can become a performance bottleneck without sufficient resources.
- Complex configuration and maintenance compared to simpler architectures.
- May expose encrypted traffic if TLS termination is mishandled.
- Limited protection for unmanaged or unsupported resources outside its scope.
Use Cases
- Distributing web traffic across a server cluster to prevent overload.
- Accelerating content delivery with caching at network edges.
- Protecting origin servers from DDoS and other web attacks.
- Offloading SSL/TLS encryption tasks from backend servers.
- Abstracting backend services behind a unified public endpoint.