Receive an object that is devoid of any content

I need help connecting Angular 2 to Express. I've successfully set up and tested the server endpoint using Postman (it seems that the content type needs to be x-www-form-urlencoded for it to work), but I'm unsure if there are any specific configurations in Angular 2 to handle that request. My suspicion is that the content-type might be incorrect.

form.ts

import {Component, ViewEncapsulation} from "angular2/core";
import {FORM_DIRECTIVES, FormBuilder, ControlGroup, AbstractControl, Validators, Control} from "angular2/common";
import { Http } from "angular2/http";

@Component({
    selector: "parameters-form",
    directives: [FORM_DIRECTIVES],
    templateUrl: "dev/form.template.html"
})
export class ParametersForm {
  myForm: ControlGroup;

  systemParameters: AbstractControl;
  param: AbstractControl;
  liftOperator: AbstractControl;
  restrictOperator: AbstractControl;
  xInitial: AbstractControl;

  system_arr: number[];
  param_arr: number[];
  restrict_arr: number[];
  lift_arr: number[];
  xinitial_arr: number[];

  constructor(fb: FormBuilder, private _http: Http) {
    // Additional code...
  }

  // More code...

server.js

var express = require('express');
var bodyParser = require('body-parser')
var cors = require('cors');

var app = express();
app.use(cors());
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())

// Rest of the server code...

Answer №1

Make sure to set the Content-Type header explicitly. Angular2 currently does not handle this for you automatically.

var headers = new Headers();
headers.append('Content-Type', 'x-www-form-encoded');
this._http.post("http://localhost:3001/export", form, {
  headers: headers
}).subscribe();

Additionally, utilize the URLSearchParams class to construct the body and convert it into a string. Currently, the body must be provided as a string when using the post / put / patch methods of the Http class.

var form = new URLSearchParams();
form.set('systemParameters', this.system_arr);
form.set('liftOperator', this.lift_arr);
(...)

this._http.post("http://localhost:3001/export", form.toString(), {
  headers: headers
}).subscribe();

Remember to import the Headers class:

import {Http, Headers} from 'angular2/http';

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