Poner headers con el uso de HttpClient se realiza de la siguiente manera:
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import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
@Injectable()
export class CabeceraService {
private headers: HttpHeaders;
constructor(private http: HttpClient) {
this.headers = new HttpHeaders({
'Content-Type': 'application/json',
});
}
solicitud(): Observable<any> {
return this.http.get('http://localhost/getDatos', {headers: this.headers});
}
}