http
8 minHTTP range requests: resume transfers without stitching different files
Use validators, Content-Range, and 416 handling to make partial downloads coherent.
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6 matching resultsArticles and interview answers
Q&A
Q&AWhy does a byte offset alone not make a download safe to resume?
The representation may have changed since the saved prefix was downloaded.
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Use a validator such as a strong ETag with If-Range, validate the 206 Content-Range before append, and verify final integrity separately. An ETag is not necessarily a cryptographic digest.
Q&A
Q&AWhy is one global SQLAlchemy Session unsafe in an async FastAPI service?
A Session carries mutable identity-map and transaction state and is not safe for concurrent requests.
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Concurrent coroutines can interleave operations on the same Session, mixing transaction state and identity-map contents. Create a session per request or task, scope its transaction clearly, and size the connection pool across all worker processes and replicas. A global Engine/pool is different from a shared mutable Session.
kubernetes
8 minKubernetes Requests, Limits, and Autoscaling: A Practical Capacity Model
Connect pod resource requests and limits to scheduling, throttling, eviction risk, and Horizontal Pod Autoscaler behavior.
python
8 minFastAPI Backpressure: Protecting Your Service from Unbounded Fan-Out
A practical guide to request concurrency, connection pools, timeouts, and overload behavior in async Python APIs.
python
8 minFastAPI Async Patterns: When to Use Background Tasks vs Real Concurrency
FastAPI is fast, but speed is not the same as correctness. Learn where async, background jobs, and bounded concurrency matter in Python services.