angular2 implements a unified http request header method

//Scheme 1: Can be used, but token information cannot be written in the service. It should be replaced by global variables, and parameter compounding issues must also be considered.@Injectable()
export class DefaultRequestOptions extends BaseRequestOptions {
  constructor() {
  super();
  ('Content-Type', 'application/json');
 }
}
export const requestOptionProvider = {provide: RequestOptions, useClass: DefaultRequestOptions};
//Scheme 2: It can be used, it is a relatively formal implementation, but in the future, you can only use myHttp object, and you must also consider the parameter compounding issue.export class myHttp extends Http {
 defaultHeaders = new Headers({
  'Content-Type': 'application/json'
 });

 constructor(_backend: ConnectionBackend, _defaultOptions: RequestOptions, private appInitService: AppInitService) {
  super(_backend, _defaultOptions);
 }

 get(url: string, options?: RequestOptionsArgs): Observable<Response> {
  let optionBuf = new RequestOptions({
   headers: ,
   params: {'token': }
  });
  //here extend options;
  return (url, optionBuf);
 }
}

export function myHttpFactory(xhrBackend: XHRBackend, requestOptions: RequestOptions, appInitService: AppInitService): myHttp {
 return new myHttp(xhrBackend, requestOptions, appInitService); // Create myHttp object}

export const myHttpProvider = {
 provide: myHttp,
 useFactory: myHttpFactory,
 deps: [XHRBackend, RequestOptions, AppInitService]
};