Cant detect http.post not connection

@Dannyg2k wrote:

Hi in ionic v-3 when dont have internet connection cant catch error , this is the code i use:

this.headers = new Headers({ ‘Content-Type’: ‘application/x-www-form-urlencoded’,
‘Accept’: ‘q=0.8;application/json;q=0.9’ });
this.options = new RequestOptions({ headers: this.headers });

let creds = JSON.stringify({ xxxxx:"yyyyy", xxyyxyyx: "jjjjjjj"});

let data = new URLSearchParams();
data.append('datajson', encodeURIComponent(creds));
var body = data.toString();

this.http.post('https://www.sitioprueba.com/ServicioWeb/general.asmx/xxx', body, {
  headers: this.headers
}).subscribe(
    data => {

     this.showToast1();
      this.datoscompletos= data.json();
    
    },
    err => {

 
      this.logError(err.json().message)
    },
    () => {

  
      }
  );

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