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One point for every published article.
A practical guide to RFC 9457: first check the HTTP status and Content-Type, then safely parse Problem Details. Using Python 3.12, we reproduce a correct 422 response, HTML from a gateway, broken JSON, incorrect types, and status mismatches.
A practical guide to protecting APIs from stale records: two clients read the same product, the first updates the stock, the second receives a 412 and retries the update only after a new GET.
Practical analysis of two Retry-After formats for HTTP 429: parsing seconds and HTTP dates, limiting wait time, and testing six boundary cases in Python 3.12.
A practical analysis of a webhook receiver: a stable event_id, a UNIQUE constraint, a transaction, a retry after a failure, and two simultaneous deliveries. The tutorial example was implemented and verified on Python 3.12 and SQLite 3.53.
The total discount on an order and the sum of discounts on its line items may diverge after rounding. We examine a precise educational calculation, a stable method for distributing the remainder, and how to preserve amounts for returns.
Deleting a record between pages shifts the result set. We examine offset, cursor, consistent snapshot, and export resumption after a failure using a small example.
Two JSON payloads with identical data can have different HMAC signatures. We show a verified example with spaces and the boundaries for authenticating incoming notifications.
A single moment can have different calendar dates in Moscow and UTC. Using a verified example, we examine day boundaries, fractional seconds, and the distinction between delivery date and event time.
Check syntax, empty files, multiple documents in sequence, and the top-level type. Read commands with verified examples for jq 1.7.
Retries in modules, libraries, and middleware handlers can multiply. We calculate a sample scenario and analyze the total operation duration, delays, and conditions for resending.
An external service expanded its list of states, but the store is unaware of the new code. We examine preserving the original event, halting dependent actions, and validating the new mapping rule.
A missing property, null, an empty string, and zero can all signify different changes. We examine the partial update contract using an online store exchange example.
