HTTP Status Codes
Quick reference for the modern web engineer
200
2xx

OK

The request has succeeded.

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201
2xx

Created

The request has succeeded and a new resource has been created.

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204
2xx

No Content

The request has succeeded but there is no content to send for this request.

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301
3xx

Moved Permanently

The URL of the requested resource has been changed permanently.

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302
3xx

Found

The URI of requested resource has been changed temporarily.

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304
3xx

Not Modified

Used for caching. The response has not been modified.

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400
4xx

Bad Request

The server could not understand the request due to invalid syntax.

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401
4xx

Unauthorized

Authentication is required to get the requested response.

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403
4xx

Forbidden

The client does not have access rights to the content.

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404
4xx

Not Found

The server can not find the requested resource.

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405
4xx

Method Not Allowed

The request method is known by the server but has been disabled.

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409
4xx

Conflict

The request conflicts with the current state of the server.

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422
4xx

Unprocessable Entity

The request was well-formed but was unable to be followed due to semantic errors.

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429
4xx

Too Many Requests

The user has sent too many requests in a given amount of time.

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500
5xx

Internal Server Error

The server has encountered a situation it doesn't know how to handle.

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502
5xx

Bad Gateway

This error response means that the server, while acting as a gateway or proxy, got an invalid response.

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503
5xx

Service Unavailable

The server is not ready to handle the request.

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504
5xx

Gateway Timeout

This error response is given when the server is acting as a gateway and cannot get a response in time.

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2xx Success

The request was received and processed.

3xx Redirection

Further action is needed.

4xx Client Error

Request contains bad syntax.

5xx Server Error

Server failed to fulfill valid request.