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HTTP status

HTTP 304 Not Modified

  • 304 Not Modified
  • Redirection
  • RFC 9110

HTTP 304 Not Modified is a redirection response: the cached copy is still valid, so no body is sent. It is defined in RFC 9110, and further action is needed to complete the request.

What it means

Status code304
Reason phraseNot Modifiedadvisory only; clients must not depend on the wording
Class3xx Redirection
MeaningThe cached copy is still valid, so no body is sent
Defined inRFC 9110
Cacheable by defaultNoonly cacheable if the response says so explicitly

How clients behave

Indicates an errorNo
Whose faultNeither, it succeeded
Body expectedNo
Location headerRequiredthe client follows it to the new target
Method preserved on redirectNo, may become GET

The 3xx class

Class meaningFurther action is needed to complete the request
Codes in this class7
Lowest in class300
Highest in class308

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