Question

When an API needs to send a very specific error message that includes details like a unique error type and an instance URI, what standardized format should an expert use?

Accepted Answer

When an API needs to send a very specific error message that includes details like a unique error type and an instance URI, an expert should use the standardized format defined by RFC 7807, titled "Problem Details for HTTP APIs." This RFC provides a generic, machine-readable format for conveying details of a problem occurring with an HTTP API response, designed to avoid the need for custom error response formats.  It ensures that clients can programmatically understand and react to specific error conditions.  The key fields specified by RFC 7807 directly address the requirements. The `type` field is a URI reference that identifies the problem type, serving as the unique error type. For example, it could be `https://example.com/probs/out-of-credit`, allowing clients to distinguish different kinds of errors. The `instance` field is a URI reference that identifies the specific occurrence of the problem, providing the instance URI as requested. This could be a path like `/orders/123/errors/xyz`, uniquely identifying *this particular error eventfor logging or debugging. In addition to these, RFC 7807 also defines other important fields: `title` provides a short, human-readable summary of the problem type; `detail` offers a human-readable explanation specific to *this occurrenceof the problem; and `status` indicates the HTTP status code (e.g., 400, 404, 500) carried in the HTTP response. Using RFC 7807 ensures a consistent, machine-readable, and extensible approach to API error handling.

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When an API needs to send a very specific error message that includes details like a unique error type and an instance URI, what standardized format should an expert use?