faraday/docs/middleware/request/authentication.md

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The Faraday::Request::Authorization middleware allows you to automatically add an Authorization header to your requests. It also features a handy helper to manage Basic authentication.

Faraday.new(...) do |conn|
  conn.request :authorization, 'Bearer', 'authentication-token'
end

With a proc

You can also provide a proc, which will be evaluated on each request:

Faraday.new(...) do |conn|
  conn.request :authorization, 'Bearer', -> { MyAuthStorage.get_auth_token }
end

Basic Authentication

The middleware will automatically Base64 encode your Basic username and password:

Faraday.new(...) do |conn|
  conn.request :authorization, :basic, 'username', 'password'
end