Generic service for all HTTP calls in Angular 2

Question

I am developing an Angular 2 application where I have some services (Angular 2 service) that communicates to my server side methods through HTTP calls. I am calling the services in components to get the data and display them on the views. This is working fine but I have written separate services for separate data operations. For example I have a Dashboard where I am loading a list of tasks, so for that I have a loadTask method in my component as follows --

public loadTask() {

        console.log('Component : Dashboard Component - Method : loadTask');
        //Get the current user
        let currentUser = JSON.parse(localStorage.getItem('currentUser'));
        this.taskListBusy = this._dashboardService.getTaskList(currentUser.EmployeeId).subscribe(
            data => this.taskListItems = data,
            error => this._errorLoggerService.logError(error, 'Dashboard/TaskList Component'),
            () => console.log("Task List For User Id - " + this._userLoginService.getCurrentUserId() + "\n" + JSON.stringify(this.taskListItems)));
    }

This method is calling a service method i.e.

this._dashboardService.getTaskList(currentUser.EmployeeId)

where _dashboardService.getTaskList() is a service method as follows --

public getTaskList(userId: any): Observable<TaskListModel[]> {
        console.log('Service - DashboardService : Method - getTaskList : Params - ' + userId);
        let postData = "userId=" + userId;

        this._requestOptions = new RequestOptions({
            method: RequestMethod.Post,
            url: this._httpHelperService.apiUrl + 'Dashboard/getTaskListByUserId',
            headers: this._httpHelperService.contentTypeJson,
            body: JSON.stringify({ 'userId': userId })
        });

        console.log('Get Task List - POST Request Query : ' + JSON.stringify(this._requestOptions));
        return this._http.request(new Request(this._requestOptions)).map(this._httpHelperService.extractData).catch(this._httpHelperService.handleError);
    }

As you can see it is doing nothing but making a http call to get the data. All I want is a generic service that will do all my HTTP calls. It should be such that I will pass the controller name, method name and parameters and then it should make the http call to get the data. Is there a way I can do this ?