uwsgi

uWSGI is a software application server that implements the uWSGI protocol and the Web Server Gateway Interface (WSGI). It hosts web applications and services, primarily in Python, and acts as a bridge between web servers and application code. The project emphasizes performance and modularity, delivering a single binary capable of serving requests, managing workers, and communicating over HTTP, FastCGI, SCGI, or the uwsgi protocol via UNIX sockets or TCP.

Its architecture centers on a master process that spawns workers and can host multiple apps. Features include Emperor mode for managing many vassals, plugin support to extend functionality, and options for synchronous and asynchronous operation. Configuration is via INI files, command line, or environment variables; it offers health checks, metrics, hot reloading, and extensive logging.

Deployment commonly pairs uWSGI with a web server such as Nginx, using the uwsgi_pass directive to route requests. While popular for Python frameworks (Django, Flask), the server also supports other languages and frameworks through plugins and can serve static files directly or proxy to a backend. It provides multiple communication channels and supports a variety of concurrency models, making it suitable for large-scale deployments.

uWSGI originated as a high-performance alternative for WSGI servers and has grown into a general-purpose application server with a broad ecosystem of plugins and integrations. It is widely used in production environments and maintained by an active community, continuing to evolve with new features for deployment, monitoring, and scalability.