Compare Apache Traffic Server vs. Kestrel vs. NGINX

Apache Traffic Server™ is a high-performance, scalable, and flexible caching proxy server that supports both HTTP/1.1 and HTTP/2 protocols. Originally developed as a commercial product, it was later contributed to the Apache Foundation by Yahoo!, and is now widely utilized by numerous prominent content delivery networks (CDNs) and content providers. By caching and reusing frequently accessed web pages, images, and web service calls, it enhances response times while minimizing server load and bandwidth consumption. The server is designed to efficiently scale on contemporary symmetric multiprocessing (SMP) hardware, capable of managing tens of thousands of requests each second. Users can easily implement features like keep-alive, content filtering or anonymization, and load balancing by integrating a proxy layer. Additionally, it offers APIs that allow for the development of custom plug-ins, enabling modifications to HTTP headers, managing Edge Side Includes (ESI) requests, or even creating unique caching algorithms. With its ability to process over 400TB of data daily at Yahoo! in both forward and reverse proxy configurations, Apache Traffic Server stands out as a robust and reliable solution for high-traffic environments. Its proven track record makes it an ideal choice for organizations looking to enhance their web infrastructure efficiency.

Kestrel serves as a versatile web server for ASP.NET Core applications, being the default server integrated into project templates. It provides support for various protocols including HTTPS and HTTP/2, though the latter is not available on macOS, and facilitates WebSockets through an opaque upgrade feature, along with Unix socket support for enhanced performance when operating behind Nginx. This web server is compatible with all platforms and versions that .NET Core accommodates. Developers must be aware that some browsers necessitate explicit permission to accept the local development certificate, and project templates are pre-configured to utilize HTTPS by default while also integrating HTTPS redirection and HSTS features. Kestrel offers specific configuration options that are particularly beneficial for deployments exposed to the internet, with distinct connection limits for those upgraded from HTTP or HTTPS to other protocols, such as during WebSocket requests. Notably, the server has a default limit for the maximum request body size set at approximately 28.6 MB, or 30,000,000 bytes, ensuring efficient handling of requests. Additionally, the flexibility of Kestrel allows developers to fine-tune these parameters according to their application's specific requirements.

NGINX Open Source is the web server that supports over 400 million websites globally. Built upon this foundation, NGINX Plus serves as a comprehensive software load balancer, web server, and content caching solution. By opting for NGINX Plus instead of traditional hardware load balancers, organizations can unlock innovative possibilities without being limited by their infrastructure, achieving cost savings of over 80% while maintaining high performance and functionality. It can be deployed in a variety of environments, including public and private clouds, bare metal, virtual machines, and container setups. Additionally, the integrated NGINX Plus API simplifies the execution of routine tasks, enhancing operational efficiency. For today's NetOps and DevOps teams, there is a pressing need for a self-service, API-driven platform that seamlessly integrates with CI/CD workflows, facilitating faster app deployments regardless of whether the application utilizes a hybrid or microservices architecture, which ultimately streamlines the management of the application lifecycle. In a rapidly evolving technological landscape, NGINX Plus stands out as a vital tool for maximizing agility and optimizing resource utilization.