Api calling ionic4
import { HttpClient, HttpHeaders } from '@angular/common/http'; import { Injectable } from '@angular/core'; import { throwError } from 'rxjs'; import { map, catchError } from 'rxjs/operators'; constructor(private http: HttpClient) { // development database this.API_HOST= ""; } OuterIdBreak(formdata) { const reqHeader = new HttpHeaders(); reqHeader.append('Content-Type', 'application/json'); return this.http.post(`${this.API_HOST}/outbound/outeridbreak/`,formdata) .pipe(map(res => res), catchError(this.errorHandler)); } errorHandler(error: Response) { console.log("RESULT:::", error); return throwError(error); }