4×× Client Error

404 Not Found

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

A 404 status code does not indicate whether this lack of representation is temporary or permanent; the 410 Gone status code is preferred over 404 if the origin server knows, presumably through some configurable means, that the condition is likely to be permanent.

A 404 response is cacheable by default; i.e., unless otherwise indicated by the method definition or explicit cache controls1.

404 Code References

.NET HTTP Status Enum HttpStatusCode.NotFound

Rust HTTP Status Constant http::StatusCode::NOT_FOUND

Rails HTTP Status Symbol :not_found

Go HTTP Status Constant http.StatusNotFound

Symfony HTTP Status Constant Response::HTTP_NOT_FOUND

Python2 HTTP Status Constant httplib.NOT_FOUND

Python3+ HTTP Status Constant http.client.NOT_FOUND

Python3.5+ HTTP Status Constant http.HTTPStatus.NOT_FOUND

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