## Request Creates Request instances from provided values. The Request's interface is inspired by the Request constructor defined in the Fetch Spec, but is considered a static value whose body can be accessed many times. There are other differences in the implementation, but this is the most significant. `Request` instances are typically created by higher-level classes, like `Http` and `Jsonp`, but it may occasionally be useful to explicitly create Request instances. One such example is when creating services that wrap higher-level services, like `Http`, where it may be useful to generate a Request with arbitrary headers and search params. ```typescript import {Injectable, Injector} from '@angular/core'; import {HTTP_PROVIDERS, Http, Request, RequestMethod} from '@angular/http'; @Injectable() class AutoAuthenticator { constructor(public http:Http) {} request(url:string) { return this.http.request(new Request({ method: RequestMethod.Get, url: url, search: 'password=123' })); } } var injector = Injector.resolveAndCreate([HTTP_PROVIDERS, AutoAuthenticator]); var authenticator = injector.get(AutoAuthenticator); authenticator.request('people.json').subscribe(res => { //URL should have included '?password=123' console.log('people', res.json()); }); ``` ### 类定义 ```typescript class Request extends Body { constructor(requestOptions: RequestArgs) method : RequestMethod headers : Headers url : string withCredentials : boolean responseType : ResponseContentType detectContentType() : ContentType detectContentTypeFromBody() : ContentType getBody() : any } ``` ### 属性 - method : `RequestMethod` Http method with which to perform the request. - headers : `Headers` - url : `string` - withCredentials : `boolean` Enable use credentials - responseType : `ResponseContentType` Buffer to store the response - detectContentType() : `ContentType` Returns the content type enum based on header options. - detectContentTypeFromBody() : `ContentType` Returns the content type of request's body based on its type. - getBody() : `any` Returns the request's body according to its type. If body is undefined, return null.