Angular2 - HTTP RequestOptions HEADERS

73
votes

I currently have an issue with tslint and was hoping someone could point me in the right direction.

I'm trying to send an HTTP GET request using HTTP provided by the Angular2 framework. With this request, I must specify the content-type and the bearer authentication token.

Example of my code:

let headers = new Headers();
let authToken = this._user.getUser().JWT;
headers.append('Content-Type', 'application/json');
headers.append('Authorization', `Bearer ${authToken}`);
let options = new RequestOptions({ headers: headers });

this._http.get('http://' + url '/', options)
            .timeout(3000)
            .subscribe(
                (res) => {

This works, however, tslint is complaining that

"TS2345: Argument of type '{ headers: Headers; }' is not assignable to parameter of type 'RequestOptionsArgs'. Types of property 'headers' are incompatible. Type 'Headers' is not assignable to type 'Headers'. Two different types with this name exist, but they are unrelated. Property 'keys' is missing in type 'Headers'."

I appreciate the support.

4
angularhttptypescripttslint
consider use const instead of let for both options and headers – Amin

4 Answers

201
votes

Update

As of today, @angular/http has been deprecated, and @angular/common/http should be used instead. So the best way to work with http headers is to import import { HttpHeaders } from '@angular/common/http'; (documentation).

Old answer

The Headers type you are supposed to import is import { Headers } from '@angular/http';.

Check your imports

9
votes

You have to update headers by:

let headers =  {headers: new  HttpHeaders({ 'Content-Type': 'application/x-www-form-urlencoded'})};
4
votes

Update for Angular 5

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

I found this in the comments from the correct answer, so If this helps somebody, good luck.

Documentation: https://angular.io/api/http/RequestOptions

2
votes

// example of headers of content type Json

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

const Url = 'http://localhost:3000/';
const headers = new Headers;
const body = JSON.stringify({
title: "data" 
});
headers.append('Content-Type', 'application/json');
this.http.post(Url, body, { headers: headers })
.pipe(map((res => res)));