angularjs - Angular 2 Http call to Node server not being invoked -


my http call node server not being invoked.

the call initiates following component:

@component({   selector: 'app-special-value',   templateurl: './special-value.component.html',   styleurls: ['./special-value.component.css'] })  export class specialvaluecomponent implements oninit {    constructor(private dataservice: dataservice) { }    ngoninit() {     this.getspecialvalueproducts();   }    getspecialvalueproducts() {     this.dataservice.getspecialvalueproducts();   }  }

the service's getspecialvalueproducts() called calls node server:

@injectable() export class dataservice { private specialvalueurl = "/api/product/specialvalue";    constructor(private http: http) { }    getspecialvalueproducts() {     console.log('getspecialvalueproducts() called');      return this.http.get(this.specialvalueurl)       .map((response: response) => response.json())       .catch(this.handleerror);   } }

the connection database successful. later call data service node function never invoked.

const express = require('express'); const router = express.router(); const mongoose = require('mongoose');  const product = require('../models/product');  module.exports = router;  const url = "mongodb://xxxxxx:xxxxxxu@xxxxx.mlab.com:111111/xxxxxx";  mongoose.promise = global.promise; mongoose.createconnection(url, function(err) {     if(err) {         console.log('error!!!' + err);     } else {         console.log('connected database!');     } });  router.get('/product/specialvalue', function(req, res) {     console.log('get specialvalue called ');  product.find({'specialvalue': true}) .sort({'price': 1})  .exec(function(err, products) {     if(err) {         console.error('error retrieving special value products!');     } else {         console.log("products = " + json.stringify(products));         res.json(products);             } })  })

node server:

const express = require('express'); const bodyparser = require('body-parser'); const path = require('path');  const api = require('./server/routes/api'); const port = 4200;  const app = express(); app.use(express.static(path.join(__dirname, 'dist')));  app.use(bodyparser.urlencoded({extended: true})); app.use(bodyparser.json());  app.use('/api', api);  app.get('*', (req, res) => {     res.sendfile(path.join(__dirname, 'dist/index.html')); });  app.listen(port, function() {     console.log('@@@@ nglowes01 server running on localhost: ' + port); })


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