Differences between PlugRest and cowboy_rest

• Each callback accepts a Plug conn struct instead of a Cowboy Req record.
• The init/2 callback is not required.
• The default values of expires/2, generate_etag/2, and last_modified/2 are nil instead of :undefined
• The content callbacks (like to_html) return {body, conn, state} where the body is one of binary(), {:chunked, Enum.t}, or {:file, binary()}.
• Other callbacks that need to set the body on PUT, POST, or DELETE, can use put_rest_body/2 taking (conn, body) before returning it. The body can only be a binary().
• The content types provided and accepted callbacks can describe each media type with a String like "text/html"; or a tuple in the form {type, subtype, params}, where params can be %{} (no params acceptable), :* (all params acceptable), or a map of acceptable params %{"level" => "1"}.
• Exceptions raised by a resource are not caught, but instead allowed to bubble up to Plug's Debugger or ErrorHandler if they are available.
• allow_missing_post defaults to false