Sometimes you might need to set the HTTP response head with different status to specify the different handled results. You can do this in Rails by add a :status to a rails method such as #respond_with. Here list all the maps:

1xx Informational

100 Continue                          :continue
101 Switching Protocols               :switching_protocols
102 Processing                        :processing

2xx Success

200 OK                                :ok
201 Created                           :created
202 Accepted                          :accepted
203 Non-Authoritative Information     :non_authoritative_information
204 No Content                        :no_content
205 Reset Content                     :reset_content
206 Partial Content                   :partial_content
207 Multi-Status                      :multi_status
226 IM Used                           :im_used

3xx Redirection

300 Multiple Choices                  :multiple_choices
301 Moved Permanently                 :moved_permanently
302 Found                             :found
303 See Other                         :see_other
304 Not Modified                      :not_modified
305 Use Proxy                         :use_proxy
307 Temporary Redirect                :temporary_redirect

4xx Client Error
400 Bad Request                       :bad_request
401 Unauthorized                      :unauthorized
402 Payment Required                  :payment_required
403 Forbidden                         :forbidden
404 Not Found                         :not_found
405 Method Not Allowed                :method_not_allowed
406 Not Acceptable                    :not_acceptable
407 Proxy Authentication Required     :proxy_authentication_required
408 Request Timeout                   :request_timeout
409 Conflict                          :conflict
410 Gone                              :gone
411 Length Required                   :length_required
412 Precondition Failed               :precondition_failed
413 Request Entity Too Large          :request_entity_too_large
414 Request-URI Too Long              :request_uri_too_long
415 Unsupported Media Type            :unsupported_media_type
416 Requested Range Not Satisfiable   :requested_range_not_satisfiable
417 Expectation Failed                :expectation_failed
422 Unprocessable Entity              :unprocessable_entity
423 Locked                            :locked
424 Failed Dependency                 :failed_dependency
426 Upgrade Required                  :upgrade_required

5xx Server Error

500 Internal Server Error             :internal_server_error
501 Not Implemented                   :not_implemented
502 Bad Gateway                       :bad_gateway
503 Service Unavailable               :service_unavailable
504 Gateway Timeout                   :gateway_timeout
505 HTTP Version Not Supported        :http_version_not_supported
507 Insufficient Storage              :insufficient_storage
510 Not Extended                      :not_extended

Addtionally, you can view all these on your local machine by installing the gem cheat, and see all status codes using command cheat status_codes.

All these informations come from internet, the codes file comes from ktkaushik’s gist and other information comes from Cody Fauser’s post