let headers = new Headers({ "myHeader": "myValue" });
headers.append("Accept", "application/json");
let params = new URLSearchParams();
params.set('myParam', 'myValue');
let options = new RequestOptions({ headers: headers, search: params });
this.http.get("/api/products", options).toPromise().then((response) => {console.log(response.json());
}); 

let body = JSON.stringify({code : "mk200"
});
let headers = new Headers({ 'Content-Type': 'application/json' }); //其实不表明 json 也可以, ng 默认好像是 json
let options = new RequestOptions({ headers: headers });
this.http.post("/api/products", body, options).toPromise().then((response) => {//do something...
});

let options = new RequestOptions({ responseType: ResponseContentType.Text });
this.http.get("/demo.csv", options).toPromise().then((response) => {console.log(response.text());
}); 

let options = new RequestOptions({method: RequestMethod.Post,url: "/api/products",headers: new Headers({ 'Content-Type': 'application/json' }),body: JSON.stringify({ code: "mk200" })
});
this.http.request(new Request(options)).toPromise().then((response) => {//do something...
});

<input type="file" (change)="onFileChanged($event.target.files)" placeholder="Upload file" accept="image/*">

onFileChanged(fileList: FileList) {if (fileList.length > 0) {let file: File = fileList[0];let formData: FormData = new FormData();formData.append('uploadFile', file, file.name);            let headers = new Headers({ "Accept": "application/json"});let options = new RequestOptions({ headers });this.http.post("https://localhost:44372/api/uploadFile", formData, options).map(res => res.json()).catch(error => Observable.throw(error)).subscribe(data => console.log('success' + data),error => console.log(error))}
}

import { Injectable } from '@angular/core';
import { Http as NgHttp, XHRBackend, RequestOptions, Request, RequestOptionsArgs, Response } from "@angular/http";import { Observable } from "rxjs/Observable";@Injectable()
export class Http extends NgHttp {constructor(backend: XHRBackend, defaultOptions: RequestOptions) {super(backend, defaultOptions);}get(url: string, options?: RequestOptionsArgs): Observable<Response>{console.log("in");return super.get(url,options);}request(url: string | Request, options?: RequestOptionsArgs): Observable<Response> {　　　　 console.log("in2");return super.request(url, options).catch((error: Response) => {console.log(error);           return Observable.throw(error);});}
}

import { Http as StoogesHttp } from "./http.service";
import { Http } from "@angular/http";@NgModule({imports: [StoogesModule, DebugRoutingModule],exports: [],declarations: [DebugComponent],providers: [{ provide : Http, useClass : StoogesHttp }] //这样就覆盖掉了. 可以参考我写的 angular2 依赖注入
})
export class DebugModule { }