HTTP status codes are an essential part of web communication, indicating the result of a client’s request to a server. Here’s an expanded list of status codes, their meanings, and how to use them in a Rails API.

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✅ HTTP Status Code Cheat Sheet

Category	Code	Symbol	Meaning	Description
1xx – Informational	100	:continue	Continue	Request received, continue processing
1xx – Informational	101	:switching_protocols	Switching Protocols	Protocol switch accepted
2xx – Success	200	:ok	OK	Request succeeded
2xx – Success	201	:created	Created	Resource created successfully
2xx – Success	204	:no_content	No Content	Success, no content returned
3xx – Redirection	301	:moved_permanently	Moved Permanently	Resource moved to a new URI
3xx – Redirection	302	:found	Found	Resource temporarily moved
3xx – Redirection	304	:not_modified	Not Modified	Use cached version
4xx – Client Error	400	:bad_request	Bad Request	Malformed request syntax
4xx – Client Error	401	:unauthorized	Unauthorized	Auth required
4xx – Client Error	403	:forbidden	Forbidden	Access denied
4xx – Client Error	404	:not_found	Not Found	Resource not found
4xx – Client Error	405	:method_not_allowed	Method Not Allowed	HTTP method not supported
4xx – Client Error	422	:unprocessable_entity	Unprocessable Entity	Validation errors
5xx – Server Error	500	:internal_server_error	Internal Server Error	Generic server error
5xx – Server Error	502	(no symbol)	Bad Gateway	Invalid upstream response
5xx – Server Error	503	:service_unavailable	Service Unavailable	Server temporarily overloaded
5xx – Server Error	504	(no symbol)	Gateway Timeout	Upstream timeout

ℹ️ For the full list of symbols supported by Rails, visit the Rails Response Status Documentation.