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Squid Proxy HTTP
Port 3128 is commonly used by proxy servers, notably Squid, for handling HTTP web caching and proxy services. It enables improved web performance by caching frequently accessed content and provides anonymity and filtering capabilities for clients accessing the internet through the proxy..
Port 3128 is widely associated with the Squid proxy server, an open-source caching and forwarding HTTP proxy. It facilitates intermediate relaying and caching of website content requested by clients, which optimizes bandwidth usage and improves response times by serving cached data for repeated requests.
Squid running on port 3128 primarily intercepts HTTP requests, acting on behalf of the client to retrieve data from servers or deliver cached content. This provides several benefits such as reduced latency, efficient utilization of network resources, and centralized control over internet access. IT administrators often deploy Squid proxies to enforce content filtering, logging, or breadcrumb tracing for network activity.
While port 3128 is the default for Squid, it can be reconfigured, and multiple proxies may utilize this port owing to its ubiquity. Its operation is layer 7 (application layer) focused and primarily over TCP. The port does not natively handle Datagram-based protocols or stream control transmission, being optimized for reliable HTTP-based traffic over TCP connections.