Apache Traffic Server™ is a high-performance, scalable, and adaptable caching proxy server that supports HTTP/1.1 and HTTP/2 protocols. Once a proprietary product, it was gifted to the Apache Foundation by Yahoo! and is now employed by numerous leading content delivery networks and website owners. By caching and reusing frequently accessed web pages, images, and web service calls, it significantly enhances response times while alleviating server load and minimizing bandwidth consumption. The server is designed to efficiently scale on contemporary symmetric multiprocessing hardware, managing tens of thousands of requests per second with ease. Users can seamlessly incorporate features such as keep-alive connections, content filtering, anonymization of requests, or implement load balancing through a proxy layer. It also offers APIs for developing custom plug-ins, providing the flexibility to modify HTTP headers, process ESI requests, or create unique caching algorithms. Successfully handling over 400TB of data daily at Yahoo! in both forward and reverse proxy configurations, Apache Traffic Server has proven its resilience and reliability in high-demand environments. This makes it an ideal choice for organizations seeking a robust solution for their caching proxy needs.