# Controller Exceptions

"ActionController::RoutingError"                     => :not_found,

"AbstractController::ActionNotFound"                 => :not_found,

"ActionController::MethodNotAllowed"                 => :method_not_allowed,

"ActionController::UnknownHttpMethod"                => :method_not_allowed,

"ActionController::NotImplemented"                   => :not_implemented,

"ActionController::UnknownFormat"                    => :not_acceptable,

"ActionDispatch::Http::MimeNegotiation::InvalidType" => :not_acceptable,

"ActionController::MissingExactTemplate"             => :not_acceptable,

"ActionController::InvalidAuthenticityToken"         => :unprocessable_entity,

"ActionController::InvalidCrossOriginRequest"        => :unprocessable_entity,

"ActionDispatch::Http::Parameters::ParseError"       => :bad_request,

"ActionController::BadRequest"                       => :bad_request,

"ActionController::ParameterMissing"                 => :bad_request,

"Rack::QueryParser::ParameterTypeError"              => :bad_request,

"Rack::QueryParser::InvalidParameterError"           => :bad_request

​

# ActiveRecord Exceptions

"ActiveRecord::RecordNotFound"   => :not_found,

"ActiveRecord::StaleObjectError" => :conflict,

"ActiveRecord::RecordInvalid"    => :unprocessable_entity,

"ActiveRecord::RecordNotSaved"   => :unprocessable_entity

>> Rack::Utils::SYMBOL_TO_STATUS_CODE

{:continue=>100,

 :switching_protocols=>101,

 :processing=>102,

 :ok=>200,

 :created=>201,

 :accepted=>202,

 :non_authoritative_information=>203,

 :no_content=>204,

 :reset_content=>205,

 :partial_content=>206,

 :multi_status=>207,

 :already_reported=>208,

 :im_used=>226,

 :multiple_choices=>300,

 :moved_permanently=>301,

 :found=>302,

 :see_other=>303,

 :not_modified=>304,

 :use_proxy=>305,

 :temporary_redirect=>307,

 :permanent_redirect=>308,

 :bad_request=>400,

 :unauthorized=>401,

 :payment_required=>402,

 :forbidden=>403,

 :not_found=>404,

 :method_not_allowed=>405,

 :not_acceptable=>406,

 :proxy_authentication_required=>407,

 :request_timeout=>408,

 :conflict=>409,

 :gone=>410,

 :length_required=>411,

 :precondition_failed=>412,

 :payload_too_large=>413,

 :uri_too_long=>414,

 :unsupported_media_type=>415,

 :range_not_satisfiable=>416,

 :expectation_failed=>417,

 :unprocessable_entity=>422,

 :locked=>423,

 :failed_dependency=>424,

 :upgrade_required=>426,

 :precondition_required=>428,

 :too_many_requests=>429,

 :request_header_fields_too_large=>431,

 :internal_server_error=>500,

 :not_implemented=>501,

 :bad_gateway=>502,

 :service_unavailable=>503,

 :gateway_timeout=>504,

 :http_version_not_supported=>505,

 :variant_also_negotiates=>506,

 :insufficient_storage=>507,

 :loop_detected=>508,

 :not_extended=>510,

 :network_authentication_required=>511}