Cowboy is a small, fast and modular HTTP server written in Erlang.


Cowboy aims to provide a **complete** HTTP stack in a **small** code base.
It is optimized for **low latency** and **low memory usage**, in part
because it uses **binary strings**.

Cowboy provides **routing** capabilities, selectively dispatching requests
to handlers written in Erlang.

Because it uses Ranch for managing connections, Cowboy can easily be
**embedded** in any other application.

No parameterized module. No process dictionary. **Clean** Erlang code.


The SPDY implementation was sponsored by
[LeoFS Cloud Storage](

The project is currently sponsored by

Online documentation

 *  [User guide](
 *  [Function reference](

Offline documentation

 *  While still online, run `make docs`
 *  Function reference man pages available in `doc/man3/` and `doc/man7/`
 *  Run `make install-docs` to install man pages on your system
 *  Full documentation in Markdown available in `doc/markdown/`
 *  Examples available in `examples/`

Getting help

 *  Official IRC Channel: #ninenines on
 *  [Mailing Lists](
 *  [Commercial Support](