rails用middleware改environment

#config/application.rb
require_relative 'boot'

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module Myapp
  class ConditionalTracker
    def initialize(app)
      @app = app
    end

    def call(env)

      env['HTTP_JWT_AUD'] = "my_jwt_aud" # 添加变量
      @app.call(env)
    end
  end

  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 6.0


    config.middleware.insert_before 1, Myapp::ConditionalTracker #  注册middleware

  end
end

#config/application.rb
require_relative 'boot'

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module Myapp
  
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 6.0

    # Implements call according to the Rack API. It simply
    # dispatches the request to the underlying middleware stack.
    def call(env)
      env['HTTP_JWT_AUD'] = "my_jwt_aud"  # 添加变量
      super(env) # Engine.call
    end
  end
end