引言 缓存是工程师优化分布式系统时首先采用的工具之一。我们会缓存已完成的响应（如数据库查询结果或HTTP响应体），以避免重复执行昂贵的任务。然而，传统缓存未能解决一个经常被忽视的低效源头，即重复的进行中请求（duplicate in-flight request）。

Web scraping tools gather a website's pertinent information for you to peruse or download. Learn how to create your own web ...

Think of a REST API like a waiter in a restaurant. You (an app) tell the waiter what you want (your request), and the waiter goes to the kitchen (the server) to get it for you. REST is just a set of ...

Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics attempts ...

Congress established the Office of Science and Technology Policy (OSTP) in 1976 to provide the President and Executive Office of the President (EOP) with advice on the scientific, engineering, and ...

James Chen, CMT is an expert trader, investment adviser, and global market strategist. Thomas J. Brock is a CFA and CPA with more than 20 years of experience in various areas including investing, ...