D-Net

import {Injectable} from '@angular/core';

import {Http, Response, Headers} from '@angular/http';

import {HttpClient, HttpErrorResponse} from "@angular/common/http";

import {Observable, throwError} from 'rxjs';

import {map, tap} from "rxjs/operators";

@Injectable()

export class ReportsService {

    // url:string = "http://beta.services.openaire.eu:8480/search/rest/v2/api/publications?format=csv&page=0&size=3&q=(%22test%22)&fq=instancetypename%20exact%20%22Dataset%22";

    constructor(private http: HttpClient) {}

//text/html

    //On the service:

   downloadCSVFile(url: string){

     //var headers = new Headers();

     //headers.append('responseType', 'arraybuffer');

     return this.http.get(url)

                .pipe(map(res => new Blob([res['_body']], { type: 'text/csv' })));

   }

   getCSVResponse(url: string){

     //var headers = new Headers();

     //headers.append('responseType', 'arraybuffer');

     return this.http.get(url)

                .pipe(map(res => res['_body']));

   }

   downloadHTMLFile(url: string, info: string){

     //var headers = new Headers();

     //headers.append('responseType', 'arraybuffer');

     return this.http.get(url)

                .pipe(map(res => this.addInfo(res, info)))

                .pipe(map(res => new Blob([res['_body']], { type: 'text/html' })))

                .pipe(tap(res => console.log(res)))

   }

   addInfo(res:any, info:string) {

       /*

       var para = res.document.createElement("P");                       // Create a <p> element

       var t = res.document.createTextNode("This is a paragraph");       // Create a text node

       para.appendChild(t);                                          // Append the text to <p>

       res.document.body.appendChild(para);

       */

       res['_body'] = info+res['_body'];

       return res;

   }

    private handleError (error: HttpErrorResponse) {

    // in a real world app, we may send the error to some remote logging infrastructure

    // instead of just logging it to the console

        console.log(error);

        return throwError(error  || 'Server error');

    }

}