Bjoern

Bjoern is an asynchronous CPython WSGI server. It is Written in C and is very lightweight. Designed from the ground up to be small and fast, it was developed using an http_parser from Ryan Dahl (also the creator of Node.js) and the libev event loop from Marc Lehmann.

With a download size of only 18KB, it is made up of fewer than 800 lines of code. It takes up less than 1 MB of memory and utilizes no coroutines or threads. Bjoern is completely WSGI compliant and is regarded as one of the highest performing WSGI servers available.

It features persistent connection support and can bind to Unix sockets and TCP host:port addresses. Bjoern is considered faster than Gunicorn and less bloated than uWSGI and Meinheld. One drawback: it is not yet compatible with HTTP/1.1.