204 No Content success status response code
indicates that the request has succeeded, but that the client doesn't need to go away
from its current page. A 204 response is cacheable by default. An
header is included in such a response.
The common use case is to return
204 as a result of a
PUT request, updating a resource, without changing the current content
of the page displayed to the user. If the resource is created,
Created is returned instead. If the page should be changed to the newly
updated page, the
200 should be used instead.
204 No Content
|RFC 7231, section 6.3.5: 204 No Content||Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content|
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- Although this status code is intended to describe a response with no body, servers
may erroneously include data following the headers. The protocol allows user agents to
vary in how they process such responses (discussion regarding this
specification text can be found here). This is observable in persistent
connections, where the invalid body may include a distinct response to a subsequent
Apple Safari rejects any such data. Google Chrome and Microsoft Edge discard up to four invalid bytes preceding a valid response. Firefox tolerates in excess of a kilobyte of invalid data preceding a valid response.