# File lib/faraday/request/phoenix.rb, line 5
    def call(env)
      # Not sure what what the X-Phx (Phoenix?) header is for but it's
      # required to access certain undocumented resources
      # e.g. GET urls/resolve
      env[:request_headers]['X-Phx'] = 'true'

      @app.call(env)
    end