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ProgrammingDEV Community ·

WhatsApp API: Adding a Contact and Sending a vCard Are Two Distinct Operations

WhatsApp's developer API separates two commonly confused actions: adding a contact to an account's address book and sending a contact card within a conversation. The add-contact operation uses a dedicated endpoint that mutates account state, while sending a vCard uses the messages endpoint with a contact message type. These operations return different results and must be handled with independent retry logic. Using the wrong operation can lead to broken workflows or duplicate actions in applications. Developers needing both outcomes, such as saving a customer and sharing a representative's details, must call each endpoint separately.

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ProgrammingDEV Community ·

Developer ditches Termux proot for Android's AVF to build Flutter APKs on ARM64

A developer running Claude Code and Flutter inside Termux with proot-distro on Android found the setup too slow due to proot's syscall interception overhead via ptrace. To fix this, they switched to Android's built-in Virtualization Framework (AVF), which provides a real isolated Linux kernel with no translation layer. Enabling AVF required turning on Developer Options and toggling the Linux Development Environment setting, which installs a Debian-based VM accessible through a Terminal app. Once inside the VM, the official Claude Code installer worked cleanly and Flutter builds ran successfully, though ARM64 incompatibilities with x86_64 SDK tools like aapt2 required separate fixes. The developer confirmed the AVF environment is fully isolated from existing Termux setups and can be removed or reset at any time through the Terminal app's settings.

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ProgrammingDEV Community ·

Developer embeds ETL failure signals directly into output files after 71-day data blind spot

A developer discovered their Reddit scraper had been returning empty arrays silently for 71 days, with no visible pipeline errors to flag the issue. The problem only surfaced when a downstream interpretation layer noticed Reddit-sourced signals had not changed in roughly two months. To prevent recurrence, three failure-reporting patterns were added directly into the daily output JSON artifact, including a per-source health boolean, a structured error array with timestamps, and a pipeline monitor that opens a GitHub issue when any source fails. Unlike runner logs that are rarely checked unless a problem is already suspected, the artifact is read on every downstream pass, making failures visible in git diffs and health checks. The interpretation layer is also now fail-closed, ignoring data from any source flagged as unhealthy rather than silently mixing bad data into weekly aggregates.

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ProgrammingDEV Community ·

Repeat-and-vote sampling makes YouTube search results more reliable for data collection

A developer found that YouTube search results are highly non-deterministic, with Jaccard similarity scores between consecutive fetches of the same query ranging from 0.43 to 0.88, meaning roughly half the video IDs can differ between two fetches. This variability stems from factors like freshness boosts, A/B testing, CDN caching, and real-time personalization — not API errors. To address this, the developer built a repeat-and-vote system that fetches each query three times and retains only videos appearing in at least two of those fetches. In a recent test run, 28 video results were discarded as noise for a single query because they failed to meet this consistency threshold. The approach deliberately trades recall for precision, prioritizing reliable market signals over comprehensive but noisy coverage.

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ProgrammingDEV Community ·

How to Build Efficient CI/CD Pipelines for Azure Kubernetes Services

Continuous Integration and Continuous Deployment (CI/CD) pipelines are critical for managing applications in cloud-native Kubernetes environments like Azure Kubernetes Services (AKS). A typical AKS pipeline begins with source code management tools such as GitHub or Azure Repos, where developer commits automatically trigger the build and test process. Code is then packaged into Docker container images and stored in a registry like Azure Container Registry before being deployed to AKS. Deployment tools such as Helm and Kustomize help automate rollouts, while strategies like Blue-Green Deployments and Canary Releases reduce the risk of downtime during updates. Together, these practices enable teams to deliver features faster, catch errors earlier, and use infrastructure resources more efficiently.

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ProgrammingDEV Community ·

How Rate Limiting in PHP and Laravel Defends Against Brute Force Login Attacks

Brute force, dictionary, and credential stuffing attacks all rely on making unlimited login requests, making rate limiting a critical defense for PHP applications. Unlike some security measures, rate limiting does not require patching a vulnerability — it simply restricts how many login attempts a server will accept within a given time window. PHP has no native rate limiting, so developers must implement it using session storage, a database, or Redis, with Redis considered the production standard for performance and reliability. Laravel provides built-in rate limiting tools that can be applied to login routes to block excessive attempts automatically. This article is the thirteenth in a series on PHP and Laravel application security, emphasizing understanding each attack method before applying countermeasures.

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ProgrammingDEV Community ·

HTTP 200 Status Codes Can Mask Silent Scraping Failures, Experts Warn

Web scraping pipelines that rely solely on HTTP status codes to confirm success can silently collect bad or outdated data, according to a technical analysis. Modern anti-bot systems increasingly respond with a 200 OK status while serving challenge pages, stale cached snapshots, or near-empty HTML shells instead of real content. These soft blocks are designed to avoid alerting scrapers, making them far harder to detect than traditional 403 or 429 error responses. A scraping job can complete with all-green metrics while feeding downstream systems with incorrect or hours-old information for weeks. Developers are advised to validate actual page content, not just request success, to catch such silent pipeline failures.

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ProgrammingDEV Community ·

Why Finishing One Task Beats Starting Ten, According to a Dev Writer

Developer and writer Serguey Asael Shinder argues that starting multiple tasks simultaneously does not constitute real progress. He notes that unfinished work creates a false sense of busyness without delivering actual results. His core advice is to complete one small thing fully before moving on to the next. Shinder suggests that true productivity is quiet and unassuming, likened to a clean, empty background. The piece is a brief reflective reminder for developers to prioritize closing existing loops over opening new ones.

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ProgrammingDEV Community ·

EverShop 2.2.1 launches with page builder, blog module, metafields, and React 19

Open-source e-commerce platform EverShop has released version 2.2.1, its most significant update since version 2.0, incorporating four months of development work. The release introduces a drag-and-drop visual page builder at /admin/page-builder, a built-in blog module with posts, categories, and tags, and typed metafields attachable to products, orders, customers, and more. Other additions include a multi-language storefront with runtime-based localization requiring no rebuild, rebuilt shipping and fulfillment tools, cloud storage support, product recommendations, and an upgrade to React 19. The update also patches several security vulnerabilities, making prompt upgrading advisable for existing users. Store owners upgrading from earlier versions should back up their databases first, as 31 automatic database migrations across 10 modules will run on first start.

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ProgrammingDEV Community ·

A 41% Failure Rate Stopped Engineers From Shipping a Temporal Knowledge Graph

A software team nearly deployed a temporal knowledge graph (TKG) system designed to give AI agents time-aware memory by storing facts with validity windows instead of relying on flat vector recall. During evaluation, the system failed 41% of the time on a key test: correctly reporting the state of a node at a specific past time T. The root cause was a flawed retrieval query that sorted facts by the most recent start time rather than filtering by the actual reference timestamp, causing the agent to return a later, incorrect fact. Standard static retrieval metrics had shown no problems, masking the issue until a time-specific evaluation test was written. The incident highlights how temporal queries disguised as simple status lookups can silently bypass conventional testing, making targeted evals critical before deployment.

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ProgrammingDEV Community ·

Why Load Testing Your Website Before Launch Can Prevent Costly Outages

Load testing simulates concurrent users hitting a website to measure server performance under expected traffic conditions, helping teams identify breaking points before real users do. Unlike stress testing, which pushes systems to failure, or soak testing, which checks for degradation over time, load testing focuses on whether a site can handle its anticipated peak traffic. Tools like loader.io offer a free, browser-based way to run load tests without any installation, making the practice accessible to small teams. Experts recommend running load tests before every major deployment rather than waiting for a live outage to expose weaknesses. Skipping load testing is particularly risky for startups and growing SaaS businesses, where a crash during a product launch or a critical customer interaction can have lasting consequences.

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ProgrammingDEV Community ·

French learning platform publishes 35-sound dataset with transparent design caveats

Language-learning product Parle has released a public CSV dataset cataloguing 35 French sounds, grouped into 14 vowels, 3 semi-vowels, and 18 consonants, designed specifically for English-speaking beginners. The team built the dataset to link IPA symbols with French spelling patterns, example words, and mouth-position cues, rather than to make a universal phonological claim. The project highlighted a core challenge in language education: French sound inventories vary depending on whether the purpose is phonological analysis, speech recognition, or beginner instruction. To avoid presenting their model as definitive, the team published explicit caveats alongside the count, documenting it as a bounded learning inventory rather than an authoritative standard. The open dataset is intentionally compact and human-readable, with each entry designed to support cross-referencing within the curriculum.

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ProgrammingDEV Community ·

AI Can Write Tests, But Human Oversight Remains Essential for Quality

A developer reflecting on AI-assisted testing tools found that while AI can quickly generate basic happy-path test cases, it struggles with business logic, edge cases, and verifying the right outcomes. The deeper concern raised is not just about generating tests, but maintaining their relevance as applications and requirements evolve over time. The author argues that AI is best treated as a supplementary tool rather than an autonomous decision-maker in the testing process. The piece invites the developer community to share how they approach reviewing and trusting AI-generated tests in real-world projects.

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ProgrammingHacker News ·

Researchers Discover Universal RCE Deserialization Gadget Chain in Ruby 4.0

Security researchers at elttam have identified a universal remote code execution (RCE) gadget chain targeting Ruby 4.0 via deserialization vulnerabilities. The flaw allows attackers to execute arbitrary code by exploiting unsafe deserialization of untrusted data. Details of the discovery were published on elttam's security research blog. The finding highlights ongoing risks associated with deserialization in modern programming languages and frameworks.

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ProgrammingDEV Community ·

Microsoft SharePoint JWT Bypass Flaw CVE-2026-55040 Actively Exploited, Patch Urged

A critical vulnerability in Microsoft SharePoint, tracked as CVE-2026-55040, is being actively exploited in the wild following its disclosure around the July 2026 Patch Tuesday release. The flaw resides in SharePoint's JWT token validation chain used for service-to-service communication, allowing attackers to forge tokens by setting the algorithm to 'none' and bypassing signature verification entirely. Successful exploitation grants unauthenticated attackers full read and write access across all SharePoint sites on a compromised server. Telemetry from KEVIntel has recorded at least twelve distinct exploitation attempts, with activity observed across the United States, Hong Kong, Japan, the Netherlands, and Taiwan. Microsoft has released a security patch that removes the flawed JWT parsing logic, and security teams are advised to apply it immediately while restricting inbound service-to-service traffic as an interim measure.

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ProgrammingDEV Community ·

How Next.js App Router CSP with Nonces Forces Every Route into Dynamic Rendering

Implementing a Content Security Policy in Next.js App Router requires a per-request nonce combined with the 'strict-dynamic' directive, as static domain allowlists cannot cover the framework's runtime chunk loading behavior. The nonce must be generated in middleware.ts and passed through both request and response headers so Next.js can apply it to its own bootstrap script tags. A key trade-off is that calling headers() to read the nonce opts every matched route out of static rendering, adding a performance cost developers should plan for. Four directives — object-src, base-uri, form-action, and frame-ancestors — can be safely added via next.config.js without nonces and remain fully cacheable. The 'strict-dynamic' keyword grants inherited trust to scripts loaded by an already-trusted script, eliminating the need for build-time hash enumeration or chunk URL lists.

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ProgrammingDEV Community ·

How to Fix Data Fetching Race Conditions in Web Apps

Race conditions in data fetching occur when multiple asynchronous HTTP requests are sent in quick succession but return responses out of order, causing the UI to display stale or incorrect data. A common example is an autocomplete search bar where a slow response for an early query overwrites a faster, more accurate response for a later one. This happens because network factors like packet loss, server load, and routing variations mean requests do not resolve in the order they were made. Traditional fixes like disabling UI elements or showing full-screen spinners technically prevent the problem but hurt user experience by making apps feel sluggish. The article argues that developers need more elegant solutions that cancel or ignore outdated responses without blocking user interaction.

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ProgrammingDEV Community ·

Conductor Lets Python Devs Run Async Task Queues on PostgreSQL Without Redis

A developer has released Conductor, an open-source Python library that uses PostgreSQL as a backend for async task queues, eliminating the need for separate message brokers like Redis or RabbitMQ. The tool is designed for teams already running PostgreSQL who want to handle background tasks such as sending emails or processing images without added infrastructure overhead. Conductor supports exactly-once task execution using PostgreSQL's transaction isolation and ON CONFLICT clauses to prevent duplicate processing. It includes production-ready features such as exponential backoff with jitter for retries, a dead letter queue for failed tasks, and Prometheus metrics for observability. The library claims throughput of over 400 tasks per second per worker and is fully compatible with Python's asyncio, including FastAPI integration.

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ProgrammingDEV Community ·

Why Android Launch Mode Can Break Deep Link State in Mobile Apps

A deep link that correctly reaches an app can still fail to restore the right state if the Android activity launch mode does not match the app's lifecycle expectations. The core issue lies in treating URI routing and application lifecycle as a single contract, when they are actually two distinct concerns. On Android, SingleTop and SingleTask behave differently when a callback arrives from a browser across task contexts, making the choice of launch mode a functional decision rather than a stylistic one. A recent fix exposed this mismatch across several Android app variants by standardising launcher declarations and adding a targeted test to catch incompatible settings. Developers are advised to funnel both cold-start and warm-callback entry points into a single, idempotent routing function that validates and safely handles incoming intents.

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