It's an array specifying the HTTP method specific constraint.

这是一个数组，指定了HTTP方法的具体约束。

youdao

Specifying this constraint through annotations means I no longer need to litter my code with repetitive conditionals that check for null and throw an exception on finding it.

通过标注指定这个约束条件意味着我的代码不再会被重复的条件弄得乱七八糟，这些条件检查 null 值，并且一旦找到该值就会抛出异常。

youdao

You can affect the geographical location of your buckets by specifying a location constraint when you create them.

在创建bucket时，可以指定位置限制，从而影响bucket的地理位置。

youdao