Explain the concept of opaque proxy and its features.

An opaque proxy is a type of proxy server that does not reveal information about the final server to the client and does not modify requests and responses, except for routing.

Features of an opaque proxy:

• The client does not see the real IP or server address; all requests go through the proxy as an intermediary.
• The proxy does not alter the content of requests and responses, only redirects them.
• Used for access control, caching, load balancing, or anonymization.

Unlike a transparent proxy, which can modify requests or responses and often does not require client configuration, an opaque proxy requires explicit client configuration to operate through it.

Example: In a corporate network, an opaque proxy can be used for traffic filtering and request logging without changing the content.