DEV Community: Ashutosh coder

CORS and Middleware in FastAPI: From Browser Handshakes to Production-Grade Configuration

Ashutosh coder — Tue, 25 Aug 2026 06:31:34 +0000

CORS errors are the bane of every frontend developer's existence, but understanding the HTTP mechanics behind them transforms you from someone who blindly adds wildcard origins to someone who configures security correctly. This deep-dive covers FastAPI's middleware stack, preflight requests, and the trade-offs that matter in production.

https://www.querystack.tech/post/cors-and-middleware-in-fastapi-from-browser-handshakes-to-production-grade-configuration-03fdd5

Sitemap Discovery with sitemapper: A Deep Dive into Automated URL Extraction

Ashutosh coder — Tue, 25 Aug 2026 06:28:08 +0000

Sitemaps are the roadmap to a website's content, but parsing them reliably is trickier than it looks. This guide explores sitemap discovery using the sitemapper library, covering index files, nested sitemaps, edge cases, and production-grade crawling strategies.

For more read

https://www.querystack.tech/post/sitemap-discovery-with-sitemapper-a-deep-dive-into-automated-url-extraction-cdd95a

Structured Clone and Transferable Objects: Moving Data Across Thread Boundaries Without Paying the Copy Tax

Ashutosh coder — Tue, 25 Aug 2026 06:26:34 +0000

Passing data between Web Workers and the main thread looks simple until you hit a 50MB ArrayBuffer and watch your UI freeze. This deep-dive explains exactly how the structured clone algorithm works, when to use transferable objects instead, and the real performance implications of each approach.

For more read
https://www.querystack.tech/post/structured-clone-and-transferable-objects-moving-data-across-thread-boundaries-without-paying-the-copy-tax-f20dd9

MongoDB Data Modeling: When to Embed Documents vs. When to Reference Them

Ashutosh coder — Thu, 20 Aug 2026 07:43:44 +0000

Storing RAG conversation history server-side is deceptively complex—naive approaches silently corrupt retrieval quality and balloon costs. This deep-dive covers storage design, context window management, and retrieval-aware session strategies.

https://www.querystack.tech/post/server-side-conversation-persistence-in-rag-systems-architecture-trade-offs-and-pitfalls-555794

React Concurrent Rendering in Practice: useTransition and useDeferredValue Explained

Ashutosh coder — Wed, 19 Aug 2026 20:35:51 +0000

React 18's concurrent features let you mark state updates as non-urgent, keeping your UI responsive under heavy load. This deep-dive unpacks how useTransition and useDeferredValue work, when to reach for each, and the subtle pitfalls that trip up even experienced engineers.
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