冷HTTP请求或热HTTP请求之间的区别? [英] Difference between Cold or Hot http requests?

问题描述

有人可以向我解释两件事吗?

Could somebody explain me two things:

• 冷HTTP请求或热HTTP请求之间的区别?
• 在Angular 2中HTTP请求是冷还是热?

推荐答案

在Angular中，通过Http服务发出的http请求很冷.

In Angular, http requests made from the Http service are cold.

在这种情况下，冷表示在有人订阅从Http.get，Http.post等返回的observable之前，不会发出http请求.此外，对http observable的每次订阅都会导致一个不同的http请求成为被解雇.这是因为，作为一个冷可观察的对象，http的可观察对象负责在订阅时创建其生产者(即Ajax请求)，并且每个订阅都将创建一个单独的值的生产者(即独立的Ajax请求).

Cold, in this context, means that the http request is not made until someone subscribes to the observable returned from Http.get, Http.post etc. Also, each subscription to an http observable will cause a different http request to be fired. This is because, as a cold observable, the http observable is responsible for creating its producer (i.e. the Ajax request) on subscription, and each subscription will create a separate producer of values (i.e. separate Ajax requests).

Thoughtram上有一篇详细的文章介绍了热与冷观测.

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