Hi Alex,
Two things. First, as the error tells you, you need to use HttpHeaders, not
Headers. See here from your example:
On Tuesday, August 7, 2018 at 7:02:01 PM UTC+2, a.kr...@ich-selber.de wrote:
>
>
> import { HttpClient, HttpHeaders } from '@angular/common/http';
> const headers = new Headers();
>
>
You import HttpHeaders from Angular, and then use Headers
<https://developer.mozilla.org/en-US/docs/Web/API/Headers> (native to
browsers). You could mix them, but it's safer to use Angular's classes in
Angular environment, due to various reasons outside of the scope here.
So use const headers = new HttpHeaders(); instead.
The other problem - HttpHeaders (the class from Angular import, the one you
actually need) is immutable. So you have to change this:
const headers = new HttpHeaders();
headers.append('appkey', '123');
Into this:
let headers = new HttpHeaders();
headers = headers.set('appkey', '123');
// or chain them all together this way:
const headers = new HttpHeaders().set('appkey', '123').set('Content-Type',
'application/json');
Anything you append to headers later in your code will not actually be
added.
Zlatko
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