    # File lib/chef/formatters/error_inspectors/run_list_expansion_error_inspector.rb, line 74
            def humanize_http_exception(error_description)
              response = exception.response
              case response
              when Net::HTTPUnauthorized
                error_description.section("Authentication Error:","Failed to authenticate to the chef server (http 401).\n")

                error_description.section("Server Response:", format_rest_error)
                error_description.section("Relevant Config Settings:","chef_server_url   \"\#{server_url}\"\nnode_name         \"\#{username}\"\nclient_key        \"\#{api_key}\"\n\nIf these settings are correct, your client_key may be invalid.\n")
              when Net::HTTPForbidden
                # TODO: we're rescuing errors from Node.find_or_create
                # * could be no write on nodes container
                # * could be no read on the node
                error_description.section("Authorization Error","Your client is not authorized to load one or more of your roles (HTTP 403).\n")
                error_description.section("Server Response:", format_rest_error)

                error_description.section("Possible Causes:","* Your client (\#{username}) may have misconfigured authorization permissions.\n")
              when Net::HTTPInternalServerError
                error_description.section("Unknown Server Error:","The server had a fatal error attempting to load a role.\n")
                error_description.section("Server Response:", format_rest_error)
              when Net::HTTPBadGateway, Net::HTTPServiceUnavailable
                error_description.section("Server Unavailable","The Chef Server is temporarily unavailable")
                error_description.section("Server Response:", format_rest_error)
              else
                error_description.section("Unexpected API Request Failure:", format_rest_error)
              end
            end