API in terms of Software Design has nothing to do with HTTP or any interprocess communication matters. API is rather a set of code elements that are exposed to the user (i.e. developer) of your module. It defines inputs as well as outputs. (There are also parts of APIs that are not elements of the code, but it’s not important here.)
Columnar or ortholinear keyboards stack the keys in orderly columns, often with rows that are not linear. Proponents claim this makes the keys easier to reach. Whether that’s true will be up to your fingers to decide, but I can say for certain that if you learned to type on a staggered keyboard, switching to a columnar layout is tough. It will take days, possibly weeks before you instinctively hit the C key. The N, M and B keys don’t fare much better.
，这一点在快连下载安装中也有详细论述
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Москалькова заявила о новых условиях Киева для возвращения россиян с территории Украины14:51