与以前的Http相比，Angular 5 HttpClient有哪些优势? [英] What are advantages of Angular 5 HttpClient over previous Http?

问题描述

我阅读了官方的升级指南，上面写着因为HttpClient得到广泛采用，因此我们决定..." 但是HttpClient带来的真正好处是什么?

I read official upgrade guide and it says something like "because HttpClient gets wide adoption we decided to..." but what are real benefits this HttpClient brings along?

我当时正在考虑尝试，但是由于我不知道升级后这些东西会发生什么而感到困惑:

I was considering to try it out, but got confused half way as I don't know what needs to happen to these after I upgrade:

从"@ angular/http"导入{Http，标头，RequestOptions，ResponseContentType}；

import { Http, Headers, RequestOptions, ResponseContentType } from '@angular/http';

我试图在新客户端中找到一个匹配项: 从'@ angular/common/http'导入{HttpClient，HttpParams，HttpHeaders}

I tried to find a "match in the new client: import { HttpClient, HttpParams, HttpHeaders } from '@angular/common/http'

但是不知道应该如何适当地升级"这些内容，因为指南对此一无所知.

But have no idea how those should be properly "upgraded" as the guide says nothing about it.

第二个问题-我们将如何处理其他http内容?

推荐答案

HttpClient接口与旧的Http接口几乎没有什么变化.最大的区别在于HttpClientModule对中间件(即HTTP拦截器)具有更好的支持.

The HttpClient interface is pretty much unchanged from the old Http interface. The big difference is that HttpClientModule has better support for middleware (i.e .HTTP interceptors).

某些功能优点:

•   Strongly typed response body access
•   JSON assumed by default (no more need to do .map(t=>t.json())
•   Better support for interceptors as middleware
•   Immutable request/response objects
•   Progress events for request upload/response download

有了新的http客户端，它可以直接将HTTP拦截器用于中间件组件.

With the new http client, its straight-forward to use HTTP interceptors for middleware components.

中间件模式的一些好处:

Some benefits of the middleware pattern:

1. HTTP请求的全局错误处理
2. 全局重试机制(即重试3次)
3. 用于长期运行的全局HTTP微调器.

例如，客户端代码(使用HttpClient)无需担心错误处理，重试或可视化等待组件-所有这些都在一个地方处理.

For example, client code (using HttpClient) does not need to worry about error handling, retries, or visual wait components – all of that is handled in one place.

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