An Elixir Plug to add CORS.

1. Add this plug to your mix.exs dependencies:

def deps do
  # ...
  {:cors_plug, "~> 0.0.1"},
  #...
end

Use it in a phoenix pipeline (or wherever):

pipeline :api do
  plug CORSPlug
  super
end

This plug will return the following headers:

On preflight (OPTIONS) requests:

• Access-Control-Allow-Origin
• Access-Control-Allow-Credentials
• Access-Control-Max-Age
• Access-Control-Allow-Headers
• Access-Control-Allow-Methods

On GET, POST, ... requests:

• Access-Control-Allow-Origin
• Access-Control-Allow-Credentials

You can configure the value of these headers as follows:

plug CORSPlug, [origin: "example.com"]

Please find the list of current defaults in cors_plug.ex.