Ionic http calls demo - Fetch API

fetch.page.ts

import { Component, OnInit } from '@angular/core';
import { Platform } from '@ionic/angular';
@Component({
  selector: 'app-fetch',
  templateUrl: './fetch.page.html',
  styleUrls: ['./fetch.page.scss'],
})
export class FetchPage {
  localhost:string = 'localhost';
  plt: string;
  web_get_restricted = 0;
  web_post_restricted = 0;
  web_put_restricted = 0;
  web_delete_restricted = 0;

  android_get_restricted = 0;
  android_post_restricted = 0;
  android_put_restricted = 0;
  android_delete_restricted = 0;

  ios_get_restricted = 0;
  ios_post_restricted = 0;
  ios_put_restricted = 0;
  ios_delete_restricted = 0;
  //  More variables for restricted API calls
  constructor(private platform: Platform) {
    this.plt = this.platform.is('mobileweb') ? 'web' :
      this.platform.is('ios') ? 'ios' : 'android';
        this.localhost ="192.168.0.7" // put your IP here
  }

  get() {
    fetch(`http://${this.localhost}:5000/ionic4fullapp/us-central1/getData?data=fromApp`)
      .then(async response => {
        if (response.ok) {
          const data = await response.json();
          this.changeStatus('get','unrestricted', 1);
        }
      })
      .catch(e => {
        this.changeStatus('get','unrestricted', 2);
      })
  }

  post() {
    const data = { data: 'postData' }
    const options = {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(data) 
    }
    fetch(`http://${this.localhost}:5000/ionic4fullapp/us-central1/postData`, options)
      .then(async response => {
        if (response.ok) {
          const data = await response.json();
          this.changeStatus('post','unrestricted', 1);
        }
      })
      .catch(e => {
        this.changeStatus('post','unrestricted', 2);
      })
  }

  put() {
    const data = { data: 'putData' }
    const options = {
      method: 'PUT',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(data) 
    }
    fetch(`http://${this.localhost}:5000/ionic4fullapp/us-central1/putData`, options)
      .then(async response => {
        if (response.ok) {
          const data = await response.json();
          this.changeStatus('put','unrestricted', 1);
        }
      })
      .catch(e => {
        this.changeStatus('put','unrestricted', 2);
      })
  }

  delete() {
    const data = { data: 'deleteData' }
    const options = {
      method: 'DELETE',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(data) 
    }
    fetch(`http://${this.localhost}:5000/ionic4fullapp/us-central1/deleteData`, options)
      .then(async response => {
        if (response.ok) {
          const data = await response.json();
          this.changeStatus('delete','unrestricted', 1);
        }
      })
      .catch(e => {
        this.changeStatus('delete','unrestricted', 2);
      })
  }

  changeStatus(type, restriction,status) {
    this[`${this.plt}_${type}_${restriction}`] = status
  }

}