Handling http api errors with problem details
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okay, let's dive into handling http api errors with problem details, a standardized approach for providing richer and more informative error responses. this tutorial will cover the what, why, and how, along with practical code examples in python using the popular flask framework.
*i. what are problem details?*
problem details are a standardized way to format http error responses, defined in rfc 9457 (previously rfc 7807). they provide a structured, machine-readable format for communicating error information to clients consuming your api.
*key properties:*
*`type` (uri):* a uri (typically an http url) that identifies the *problem type*. this is the most important field, as it should point to a document (human-readable or machine-readable) that explains the nature of the error. you can define your own types or use existing standard ones. for example, `https://example.com/problems/out-of-s...` or `https://tools.ietf.org/html/rfc9110se...` (for a 400 bad request).
*`title` (string):* a short, human-readable summary of the problem type. this should not be specific to the particular occurrence of the error, but rather a general description of the problem type. for example, "out of stock".
*`status` (integer):* the http status code applicable to this problem. this should match the actual http status code of the response.
*`detail` (string):* a human-readable explanation specific to this occurrence of the problem. this provides more context for the user or developer to understand what went wrong. for example, "product 'widget a' is currently unavailable."
*`instance` (uri):* a uri that identifies the specific occurrence of the problem. this could be a log id, a resource identifier, or any other unique value. optional, but useful for tracing errors.
*extensions (custom fields):* you can add any additional fields you need to provide more context. for example, if the error is related to a form, you might include a `fie ...
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