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To understand what caused a failure, distinguish between errors reported at the HTTP protocol level, through HTTP status codes, and errors reported at the application level (HUB2 API).

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HTTP error status codes

An HTTP error status code (HTTP 4XX or HTTP 5XX) indicates an issue in the communication between the HTTP client and the HTTP server, or in the processing of the request. These standardized codes are included in the server response and indicate the outcome of the HTTP request. See Error management for the error format and the status codes returned by the HUB2 API.

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Application errors

Application errors are reported through HUB2 error codes, either in the code field of an HTTP error response or, for asynchronous processing, as failure causes on the transaction. See also:

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Fixing an error

An HTTP error status code indicates an issue in the communication (or with the request) between the client and the server, whereas an application error reflects an issue encountered during the asynchronous processing of a transaction at HUB2, outside the context of the HTTP request. The failure causes listed in the application error pages only cover errors encountered during asynchronous processing. For the HTTP status codes each endpoint can return, see the HUB2 API Reference.