如何在不使用构造函数DI的情况下创建Http实例? (RC.5 +) [英] How to create an Http instance WITHOUT using constructor DI? (RC.5+)

问题描述

我需要获取Http实例而不使用Angular2的DI(构造函数(私有http:Http))

I need to get an instance of Http without using Angular2's DI ( constructor(private http: Http) )

以下代码摘自另一个stackoverflow问题，并且它可以在Angular2 RC.4和更早的版本中使用，但在RC.5 +中不可用(HTTP_PROVIDERS不再可用):

The following code was taken from another stackoverflow question, and it works in Angular2 RC.4 and earlier versions, but not in RC.5+(HTTP_PROVIDERS is no longer available) :

const injector = ReflectiveInjector.resolveAndCreate([
  HTTP_PROVIDERS
]);

this.http = injector.get(Http);

关于Stackoverflow，这里有几个问题，它们具有相同代码的不同变体，但它们都无法在RC.5 +中使用.

There are several questions here on Stackoverflow with different variants of that same code, but none of them works in RC.5+.

有人知道如何在RC.5 +中执行相同的操作吗?

Does anybody know of how to perform that same thing in RC.5+?

推荐答案

只需查看

Just look at the source for HttpModule. You'll see all the providers required to create the Http. Most of those providers were what were in the now removed HTTP_PROVIDERS

export function _createDefaultCookieXSRFStrategy() {
  return new CookieXSRFStrategy();
}

export function httpFactory(xhrBackend: XHRBackend, requestOptions: RequestOptions): Http {
  return new Http(xhrBackend, requestOptions);
}

@NgModule({
  providers: [
    {provide: Http, useFactory: httpFactory, deps: [XHRBackend, RequestOptions]},
    BrowserXhr,
    {provide: RequestOptions, useClass: BaseRequestOptions},
    {provide: ResponseOptions, useClass: BaseResponseOptions},
    XHRBackend,
    {provide: XSRFStrategy, useFactory: _createDefaultCookieXSRFStrategy},
  ],
})
export class HttpModule {
}

只需将上述providers中的所有内容添加到传递给ReflectiveInjector.resolveAndCreate的数组中即可.

Just add everything in the above providers to the array you pass to ReflectiveInjector.resolveAndCreate.

如果您的目标是在引导之前获取Http，则还需要注意另一件事，那就是CookieXSRFStrategy.它在引导之前将不起作用，因为它依赖于某些平台浏览器的内容.您可以将其替换为noop，如此帖子

If your goal is to get the Http before bootstrap, there's another little thing you need to take care of, which is the CookieXSRFStrategy. It will not work prior to bootstrapping, as it is dependendent on some platform browser stuff. You can just replace it with a noop, as mentioned in this post

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