Bart Rozycki — WritingI design reliable backend and platform systems for payments, security, media, and AI. Explore open-source projects, case studies, and technical writing.https://bartrozycki.com/enBuilding Safe HTTPX Retry Policies in Python with Backoff, Timeouts and Async Failure Handlinghttps://bartrozycki.com/writing/httpx-retry-python/https://bartrozycki.com/writing/httpx-retry-python/A practical guide to HTTPX retry policies in Python covering connection failures, 429/5xx responses, exponential backoff, Retry-After, timeouts, async cancellation and idempotency.Fri, 07 Aug 2026 00:00:00 GMThttpxpythonretriesManaging OpenAI Timeouts in Python for Request Limits, Retries and Long-Running Responseshttps://bartrozycki.com/writing/openai-timeouts-python/https://bartrozycki.com/writing/openai-timeouts-python/How to configure OpenAI timeouts in Python without hiding retries, exceeding operation budgets, or mishandling long reasoning and streaming responses.Tue, 04 Aug 2026 00:00:00 GMTopenaipythontimeoutsWhat Python Requests Timeouts Mean for Connect, Read and Failure Modeshttps://bartrozycki.com/writing/python-requests-timeouts/https://bartrozycki.com/writing/python-requests-timeouts/A practical guide to Python Requests timeouts covering connect vs read timeouts, tuple values, streaming behavior, retries, ambiguous POST outcomes, testing, and production defaults.Fri, 31 Jul 2026 00:00:00 GMTpythonhttptimeoutsRelPrim 0.9.0 Adds Provider-Aware Rate-Limit Recoveryhttps://bartrozycki.com/writing/relprim-0-9-0-rate-limit-recovery/https://bartrozycki.com/writing/relprim-0-9-0-rate-limit-recovery/RelPrim 0.9.0 adds provider-aware retry delays, maximum wait enforcement and fallback integration for external operations rejected by rate limits.Thu, 30 Jul 2026 00:00:00 GMTrelprimpythonreliabilityrate-limitingBuilding Idempotency in REST APIs with Keys, Concurrency and Safe Retrieshttps://bartrozycki.com/writing/idempotency-in-rest-apis/https://bartrozycki.com/writing/idempotency-in-rest-apis/A practical guide to idempotency keys in REST APIs: how to scope them, coordinate concurrent requests, replay results, and recover when the first outcome is uncertain.Tue, 28 Jul 2026 00:00:00 GMTrest-apisidempotencyRelPrim 0.8.0 Adds Idempotency for Safe Retrieshttps://bartrozycki.com/writing/relprim-0-8-0-idempotency-helpers/https://bartrozycki.com/writing/relprim-0-8-0-idempotency-helpers/RelPrim 0.8.0 adds idempotency policies, concurrent execution joining and successful result replay for external operations that must not run twice.Mon, 27 Jul 2026 00:00:00 GMTrelprimpythonreliabilityidempotencyReliable External Operations Are More Than Retrieshttps://bartrozycki.com/writing/reliable-external-operations/https://bartrozycki.com/writing/reliable-external-operations/Retries solve only one failure mode. This article introduces a coherent execution policy for timeouts, retries, idempotency, circuit breakers, rate limits, fallbacks, observability, and recovery at external boundaries.Tue, 21 Jul 2026 00:00:00 GMTdistributed-systemsreliabilityexternal-operations