Purpose of a proxy server in networked applications: Which option best captures the primary role a proxy server plays in web architectures?

Introduction / Context:
A proxy server sits between clients and origin servers and intermediates web traffic. Proxies are used for request routing, caching, policy enforcement, logging, and sometimes as part of a layered security model (when combined with firewalls, WAFs, and identity systems).

Given Data / Assumptions:

• The context is typical HTTP(S) web usage.
• Clients issue requests for web content that a proxy can forward, cache, or filter.
• Proxies are not a replacement for network stacks like TCP/IP.

Concept / Approach:

In its simplest role, a proxy receives a client’s HTTP request and forwards it to the appropriate web server, optionally caching the response. This improves performance and centralizes control. While proxies can contribute to security by masking internal networks and enforcing access rules, their core function is request mediation for web content.

Step-by-Step Solution:

Verification / Alternative check:

Examine a corporate proxy setup: browsers are configured to send HTTP/HTTPS requests to the proxy, which fetches content from origin servers and enforces policies.

Why Other Options Are Wrong:

Security against unauthorized users is broader than a proxy's primary purpose; proxies help but are not sole security controls.

Processing DB access is a separate tier (app servers/drivers) rather than standard proxy duty.

Providing TCP/IP is an OS/network stack function, not a proxy's role.

Common Pitfalls:

Assuming proxies replace firewalls or application logic; conflating reverse proxies, forward proxies, and load balancers without distinguishing their roles.

Final Answer:

To process client requests for Web pages