HTTP 499 (Token Required): meaning and handling

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 499 is an ArcGIS vendor response indicating that a required access token was missing.

Could be also:
Constant	Type	OS
HTTP_STATUS_CLIENT_CLOSED_REQUEST	HTTP Code	Any

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HTTP_STATUS_INVALID_TOKEN	HTTP_STATUS_CLIENT_CLOSED_REQUEST

HTTP_STATUS_TOKEN_REQUIRED

ArcGIS documents 499 separately from NGINX 499: here it means that the request reached an ArcGIS service which requires a token but did not receive one. The same numeric code has different meanings across products.

Obtain a valid token through the supported ArcGIS authentication flow and send it using the method documented for that service. Check token scope, expiration, and whether the operation requires additional privileges.

ArcGIS uses this vendor status to distinguish a missing token from 498, where a supplied token is invalid. Obtain a token through the supported authentication flow and send it using the mechanism documented for the service. Avoid embedding long-lived credentials in URLs or logs while correcting the request.

ArcGIS REST API error output

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