xfw: all-in-one REST API

xfw is a self-working API coded in Go:

It allows anyone to create a fully featured REST API
it can be used in Go as a library, or as a proxy to launch external commands (e.g. php scripts)

It is based on the all-in-config idea, where you only have a configuration file, and your implementation and it works without no further work.

Here's a taste of some features:

human-readable json configuration
nested routes (i.e. /user/:id: vs. /user/post/:id:)
useful http methods: GET, POST, PUT, DELETE
manage URL, query and body arguments:
- multipart/form-data
- application/x-www-form-urlencoded
- application/json
required vs. optional parameters with a default value
parameter renaming
generic authentication system (i.e. you can override the built-in)
generic type check (i.e. implement your types alongside built-in types)