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The plug specification.

There are two kind of plugs: function plugs and module plugs.

#### Function plugs

A function plug is any function that receives a connection and a set of
options and returns a connection. Its type signature must be:

    (Plug.Conn.t, Plug.opts) :: Plug.Conn.t

#### Module plugs

A module plug is an extension of the function plug. It is a module that must

* a `call/2` function with the signature defined above
* an `init/1` function which takes a set of options and initializes it.

The result returned by `init/1` is passed as second argument to `call/2`. Note
that `init/1` may be called during compilation and as such it must not return
pids, ports or values that are not specific to the runtime.

The API expected by a module plug is defined as a behaviour by the
`Plug` module (this module).

## Examples

Here's an example of a function plug:

    def json_header_plug(conn, opts) do
      conn |> put_resp_content_type("application/json")

Here's an example of a module plug:

    defmodule JSONHeaderPlug do
      def init(opts) do

      def call(conn, _opts) do
        conn |> put_resp_content_type("application/json")

## The Plug pipeline

The `Plug.Builder` module provides conveniences for building plug
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