erlyrest

A wrapper over cowboy web server, simplifies the development of restfull api

simplifies handling of http request. You don't need to start cowboy and its dependencies obviously (all incapsulated)
provides several built-in request validating features: ip whitelist filter, basic auth, alowed methods
built-in body decoding/encoding. Supports xml, json, form_urlencoded, multipart data (without files), automatic detection
built-in workflow, that allows you to create buisness logic by passing functions as parameters to erlyrest.

You can also:

interrupt your function flow at any place and response on http request by calling erlyrest:reply/2 (non functional style, but can be useful in some cases)

You just need to add erlyrest dependency in your projects rebar.config file

{deps, [
        ...
    {erlyrest,      ".*", {git, "https://github.com/sergebond/erlyrest.git",      {branch, "master"}}}
    ]}.

sergebond/erlyrest