This article walks through Nacos's LongPollingService source code, showing how it extracts headers, calculates timeouts, detects configuration changes, enforces connection limits, and uses Servlet 3.0 AsyncContext to handle long‑polling without blocking threads.
This article reviews the latest TC39 proposals that have advanced to Stage 4—including Change Array By Copy, Intl.NumberFormat V3, and Symbol as WeakMap Keys—explains their new immutable‑array methods, international‑number formatting APIs, weak‑map key support, and also highlights proposals moving between other stages such as Async Context and ArrayBuffer transfer.
The article introduces the TC39 Async Context proposal, explains why asynchronous context is needed, shows a library implementation using run and log functions, describes the AsyncContext API with run, get, and wrap methods, and explores use cases such as trace propagation, task‑priority handling, and comparisons with thread‑local storage and Node.js AsyncLocalStorage.
This article explains the TC39 Async Context proposal, demonstrates how it lets developers propagate identifiers and other values across synchronous and asynchronous JavaScript call stacks, and shows practical use cases such as tracing, task scheduling, and comparisons with thread‑local storage.
