angular6版本的项目启动后，发请求就报错?

后台管理系统启动正常，在登录页面点登录就报错（本人是熟悉vue，他这请求库不是axios也不是fetch）：

import { Http } from '@angular/http';

// 报错信息：
app.service.ts:145 ERROR Error: Uncaught (in promise): TypeError: rxjs__WEBPACK_IMPORTED_MODULE_2__.Observable.throw is not a function
TypeError: rxjs__WEBPACK_IMPORTED_MODULE_2__.Observable.throw is not a function
    at CatchSubscriber.selector (http.service.ts:38:30)

接口单独拿工具（postman或apifox等）测是正常的，也就是后端无问题也不是跨域问题。
初步判断是这个项目包版本的问题。我也不能大改不敢升级最新版，太多包是8年前的了。只能小改，如何改

  "dependencies": {
    "@angular/animations": "^6.1.0",
    "@angular/common": "^6.1.0",
    "@angular/compiler": "^6.1.0",
    "@angular/core": "^6.1.0",
    "@angular/forms": "^6.1.0",
    "@angular/http": "^6.1.0",
    "@angular/platform-browser": "^6.1.0",
    "@angular/platform-browser-dynamic": "^6.1.0",
    "@angular/router": "^6.1.0",
    "@antv/data-set": "^0.8.9",
    "@antv/g2": "^3.5.7",
    "core-js": "^2.5.4",
    "essence-ng2-print": "^1.1.0",
    "ng-zorro-antd": "^1.6.0",
    "rxjs": "~6.2.0",
    "zone.js": "~0.8.26",
    "tinymce": "^5.0.2",
    "@tinymce/tinymce-angular": "^3.0.0"
  },

// app.service.ts 代码头如下：
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import { ActivatedRoute, Router } from '@angular/router';
//表单 绑定规则、控件组、响应式表单验证（驱动式表单验证）
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
//消息提示
import { NzMessageService, NzModalService } from 'ng-zorro-antd';

@Injectable()
export class AppService {

// http.service.ts 文件如下：
import { Injectable } from '@angular/core';
import { Http, Request, RequestOptionsArgs, Response, RequestOptions, ConnectionBackend, Headers } from '@angular/http';
import { Observable } from 'rxjs';

import { map, catchError } from 'rxjs/operators';
@Injectable()
export class HttpService extends Http {
  constructor(backend: ConnectionBackend, defaultOptions: RequestOptions) {
    super(backend, defaultOptions);
  }
  request(url: string | Request, options?: RequestOptionsArgs): Observable<Response> {
    //根据不同的生产环境配置http前缀
    typeof url == 'string' ? url : url.url;
    return this.intercept(super.request(url, options));
  }
  get(url: string, options?: RequestOptionsArgs): Observable<Response> {
    return this.intercept(super.get(url, options)).pipe(map(res => res.json()));
  }
  post(url: string, body: any, options?: RequestOptionsArgs): Observable<Response> {
    return this.intercept(super.post(url, body, this.getRequestOptionArgs(options))).pipe(map(res => res.json()));
  }
  put(url: string, body: any, options?: RequestOptionsArgs): Observable<Response> {
    return this.intercept(super.put(url, body, this.getRequestOptionArgs(options)));
  }
  delete(url: string, options?: RequestOptionsArgs): Observable<Response> {
    return this.intercept(super.put(url, this.getRequestOptionArgs(options)));
  }
  getRequestOptionArgs(options?: RequestOptionsArgs): RequestOptionsArgs {
    options = options == null ? new RequestOptions() : options;
    options.headers = options.headers == null ? new Headers() : options.headers;
    let token = localStorage.getItem('token');
    options.headers.append('Content-Type', 'text/plain;charset=UTF-8');
    options.headers.set('token', token);
    return options;
  }
  intercept(observable: Observable<Response>): Observable<Response> {
    return observable.pipe(catchError((err, source) => {
      return Observable.throw(err);
    }));
  }

}

angular6版本的项目启动后，发请求就报错?

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