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Idempotency is not a key, it's a contract
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DEV Community · Technology

Idempotency is not a key, it's a contract

Every payments API has an Idempotency-Key header. Far fewer have written down what it means, and the ones that haven't are usually running a SELECT … WHERE key = ? before the insert and calling the job done. A key is a token. A contract is a set of answers: what counts as the same request, how long...

Rasikh
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Your Amazon scraper is returning mixed currencies and won't tell you
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DEV Community · Technology

Your Amazon scraper is returning mixed currencies and won't tell you

If you scrape Amazon through rotating residential proxies, your price column probably contains dollars, euros and zloty at the same time. Nothing in the markup says which is which, no error is raised, and the mixture changes from run to run. I spent a week measuring what an Amazon scraper actually...

Roman
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How to Create an MCP Server: Tutorial
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DEV Community · Technology

How to Create an MCP Server: Tutorial

Model Context Protocol (MCP): Building an AI-to-API Bridge 1. What Is MCP? Model Context Protocol (MCP) allows an AI assistant such as Kiro, Codex, Claude, or another MCP-compatible agent to interact with external systems in a structured way. A useful mental model is: AI Ag...

Santanu Bhattacharya
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Offline_SOS_System
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DEV Community · Technology

Offline_SOS_System

Pub.dev Package: Link GitHub Repository: Link Imagine getting into a serious car crash in a remote area—a mountain pass, a highway dead zone, or a rural road with zero cell signal. You open your safety app, or its automated background trigger fires... only to hang indefinitely because it relies on...

Koduru Annarao
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Jesus Was Right. You Are God and Infinite.
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DEV Community · Technology

Jesus Was Right. You Are God and Infinite.

Hey everyone 👋, I wrote in Christianity Makes Perfect Sense! about how some truths are deeply unfashionable, and how the discomfort a truth produces is often the surest sign that it is worth sitting with. This post is in that spirit. I want to talk about something that I have been turning over in...

Mahmoud Harmouch
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My First Github Project:From a Local Folder to GitHub Using Git and SSH
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DEV Community · Technology

My First Github Project:From a Local Folder to GitHub Using Git and SSH

Introdction I always knew that GitHub is where developers keep and share their projects but I have always wondered how developers get the projects from their computers onto GitHub.When I started learning Git aeverything started falling into place. I recently worked on my first GitHub proj...

Mercy Siele
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Kubernetes Explained: Why Every Cloud & DevOps Engineer Should Learn It 🚀
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DEV Community · Technology

Kubernetes Explained: Why Every Cloud & DevOps Engineer Should Learn It 🚀

Imagine you have one application running on a single server. Everything is fine. Then your users increase from 1,000 → 10,000 → 100,000. Suddenly, one server isn't enough. You need more servers. You need automatic scaling. You need load balancing. You need application recovery when something...

Yash Sonawane
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A local-first memory daemon for AI agents: SQLite + ONNX, zero API calls
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DEV Community · Technology

A local-first memory daemon for AI agents: SQLite + ONNX, zero API calls

Cloud memory tiers have a fundamental problem: your agent context - the most sensitive data you have - leaves your machine. I wanted memory that never does. So Awareness runs a local-first daemon: npx @awareness.market/local start No account. No API key. No cloud. SQLite + ONNX embeddings...

Everest An
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Fix Local LLM Quality: Context Stacking & Rope Freq Tweaks
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DEV Community · Technology

Fix Local LLM Quality: Context Stacking & Rope Freq Tweaks

This article was originally published on BuildZn. Everyone's running local LLMs now, which is great. But then they hit the wall: "Why does my 7B model on Ollama feel dumber than a cloud API?" You've got the tokens/second, but the quality sucks. Figured it out the hard way after pulling my hair ou...

Umair Bilal
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What makes a Mac voice assistant private?
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DEV Community · Technology

What makes a Mac voice assistant private?

A voice assistant can run in a native Mac window and still send audio, prompts, or memory somewhere else. I do not treat "private" as a model label. I treat it as a property of the entire data path. That path includes audio capture, transcription, planning, speech generation, retained history, perm...

Sarthak Agrawal
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HTTP 402 was the easy part — x402scan still refused the tunnel
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DEV Community · Technology

HTTP 402 was the easy part — x402scan still refused the tunnel

This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry. The protocol looked finished when curl printed 402. The catalog disagreed. An ephemeral Cloudflare tunnel was a perfect Payment Required and still not a listing. The smash was realizing those are different bugs....

labstek9-glitch
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Two Pieces of Code, Same Answer — Which One Should You Write?
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DEV Community · Technology

Two Pieces of Code, Same Answer — Which One Should You Write?

Introduction This is my first post. It has been one year since I became an engineer with no prior experience. Now, once you become an engineer and start learning programming, there is a phrase you will hear at least once: "Shorter (simpler) code is better." Is that true? The other day,...

yuudaikido
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De atendimento e logística para a programação.
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DEV Community · Technology

De atendimento e logística para a programação.

Olá, comunidade! 👋 Me chamo Gabriel Nandes, tenho 24 anos e essa é minha primeira aqui! Atualmente curso o 1º semestre de Análise e Desenvolvimento de Sistemas na Universidade Cruzeiro do Sul, e resolvi começar a documentar minha jornada na área de tecnologia, tanto pra manter um registro de tudo...

Gabriel Nandes
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I Built a Chrome DevTools Extension to Mock APIs Without Leaving the Browser
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DEV Community · Technology

I Built a Chrome DevTools Extension to Mock APIs Without Leaving the Browser

Every frontend developer knows this pain: the backend isn't ready, it's down, or it returns data that doesn't match the design. You need to build UI against an API that doesn't exist yet. The usual workarounds all have friction: Spin up a mock server (json-server, mockoon) — another process, ano...

Charles
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GitHub Project :Understanding git work flow
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DEV Community · Technology

GitHub Project :Understanding git work flow

INTRODUCTION My first week at LuxDev Academy as a beginner in the tech field was awesome since all tutors gave us hands on tutoring , we covered installation of apps and understanding coding languages. For today I'll cover git workflow and all its components . Version control can feel ov...

Frank Hahanyu
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JOAN experimental alpha: seeking 3 independent agent evaluators
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DEV Community · Technology

JOAN experimental alpha: seeking 3 independent agent evaluators

JOAN is an experimental, agent-native language and verification substrate. Real .joan source can be parsed, checked, formatted, compiled to deterministic bytecode, and executed in a bounded VM. We are looking for three independent evaluators to run one small, reproducible GitHub-only task: safe rep...

Yoan V
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Building an HTTP Server From Scratch using TCP.
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DEV Community · Technology

Building an HTTP Server From Scratch using TCP.

HTTP is something I interact with every single day, whether I am fetching data on the frontend or building backend APIs. But for a long time, if you had asked me how it actually worked under the hood, I wouldn't have had a good answer. I always treated HTTP like this intimidating, hyper-complex blac...

Dev Dhanadiya
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Why Static Export Wins Over Serverless APIs for Web Utility Tools
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DEV Community · Technology

Why Static Export Wins Over Serverless APIs for Web Utility Tools

When designing modern micro-SaaS web utilities (calculators, formatters, text cleaners), developers often default to Serverless Edge Functions or Server-Side Rendering (SSR). However, for single-task utility sites, this approach often introduces unnecessary architecture overhead: cold-start latenc...

sir lu
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