node.js - Unable send data from backend(nodejs) to frontend(angular2) -


i have data queried elasticsearch through nodejs , want send frontend. when try shows me error below.

error error: uncaught (in promise): response status: 0  url: null @ resolvepromise (zone.js:783) @ zone.js:709 @ rejected (messages-component.js:14) @ zonedelegate.invoke (zone.js:391) @ object.oninvoke (ng_zone.ts:296) @ zonedelegate.invoke (zone.js:390) @ zone.run (zone.js:141) @ zone.js:831 @ zonedelegate.invoketask (zone.js:424) @ object.oninvoketask (ng_zone.ts:288)

back-end looks this,

var name = ".class";  rama();  function rama() { 'use strict';  const elasticsearch = require('elasticsearch'); const esclient = new elasticsearch.client({   host: '127.0.0.1:9200',   log: 'error' });  const search = function search(index, body) {   return esclient.search({index: index, body: body}); };  const test = function test() {   let body = {     size: 20,     from: 0,     query: {       match: {         jarfilename: {           query: 'cambioclient.jar'         }       }     }   };   search('clsdex', body)   .then(results => {     results.hits.hits.foreach((hit, index) => name="test");   })   .catch(console.error); };  test(); };  var express = require('express'); var app = express();  var messages = [{text: name, owner: 'tim'},{text: 'other message', owner:'jane'}];  app.use((req, res, next) => { res.header("access-control-allow-origin", "*"); res.header("access-control-allow-headers", "origin, x-requested-with,  content-type, accept"); next(); })  app.get('/messages', (req, res) => { res.json(messages); })  app.listen(11500);

this part in front-end(message-component.ts) receiving results,

import { component } '@angular/core'; import { webservice } './web.service';  @component({ selector: 'messages', template: ` <div *ngfor="let message of messages">     <md-card style="margin:8px">         <md-card-title>{{message.owner}}</md-card-title>         <md-card-content>{{message.text}}</md-card-content>     </md-card> </div> ` }) export class messagescomponent {  messages = [];  constructor(private webservice: webservice) {}  async ngoninit() {     var response = await this.webservice.getmessages();     this.messages = response.json(); } }

where mistaken this? please me figure out.


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