What does HTTP status 499 (Client Closed Request) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 499 is a nonstandard NGINX log status indicating that the client ended the connection first.

Could be also:
Constant	Type	OS
HTTP_STATUS_TOKEN_REQUIRED	HTTP Code	Any

Previous	Next
HTTP_STATUS_TOKEN_REQUIRED	HTTP_STATUS_SERVER_ERROR

HTTP_STATUS_CLIENT_CLOSED_REQUEST

The server may have been processing normally when the browser, mobile app, proxy, or network path abandoned the request. It is therefore often a client-side cancellation or an effect of a downstream timeout, not an origin application error.

Compare request duration with client and proxy timeouts, then look for aborts, navigation changes, load-balancer limits, or mobile network interruptions. Do not treat 499 as proof that the server deliberately rejected the request.

Correlate client and upstream timing

A 499 entry often means the upstream application was still working when the browser, API client, load balancer, or another intermediary abandoned the request. Correlate client timeout settings with NGINX request time and upstream timing. A slow origin can therefore produce many 499 log entries even though NGINX itself did not reject the requests.

NGINX HTTP module documentation

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