如何在ionic 3应用程序中禁用请求缓存或添加刷新? [英] How to disable request caching or add refresh in ionic 3 app?

问题描述

我的离子应用程序遇到了麻烦: 在ionViewWillEnter()上，我向服务器请求GET请求以获取数据. 如果我是第一次打开该页面，则发送请求. 如果是第二次开放，则应用读取缓存并不发送请求. 此故障仅在设备上存在. 任何的想法 ? 谢谢.

I have a trouble with my ionic app : on ionViewWillEnter() I request the server with a GET request to get datas. If I open the page for the first time, the request is sent. If it's a second opening, app read the cache and doesn't send request. This trouble exists only on device. Any idea ? Thx.

我正在使用这个版本: @ ionic/app-scripts:3.2.0
Cordova平台:iOS 4.5.5
离子框架:离子角3.9.2

EDIT : I'm using this version : @ionic/app-scripts : 3.2.0
Cordova Platforms : ios 4.5.5
Ionic Framework : ionic-angular 3.9.2

所有请求都进入拦截器:

All requests go into an interceptor :

import { Injectable, NgModule} from '@angular/core';

import { Observable } from 'rxjs/Observable';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpHeaders} from '@angular/common/http';
import {Globals} from './globals';
@Injectable()
export class HttpsRequestInterceptor implements HttpInterceptor {
headers : HttpHeaders;
  constructor(private globals: Globals){}
 intercept(
   req: HttpRequest<any>,
   next: HttpHandler): Observable<HttpEvent<any>> {
     if(localStorage.getItem('jwt')){
       this.headers = new HttpHeaders({'Authentication':localStorage.getItem('jwt'),'Cache-Control':['no-cache','no-store'],'Pragma':'no-cache','Expires': '0'});
   }else{
     this.headers = new HttpHeaders({'Authentication':''});
   }
     const dupReq = req.clone({ headers: this.headers });
     return next.handle(dupReq);
   }
};

我在服务器上启用了所有CORS.

I have all CORS enabled on my server.

在我的控制器中，我这样做:

In my controller I do this :

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams,LoadingController } from 'ionic-angular';
import {UserService} from '../../providers/user-service';
import {AlertService} from '../../providers/alert-service';
import { TranslateService } from '../../app/translate';

@IonicPage()
@Component({
  selector: 'page-user-messages',
  templateUrl: 'user-messages.html',
})
export class UserMessagesPage {
messagesList;
  constructor(public navCtrl: NavController, public navParams: NavParams,public translateService:TranslateService,
    public alertService : AlertService, private userService : UserService,public loadingCtrl: LoadingController) {

  }
/**
* Show user's messages
**/
  ionViewWillEnter() {
    let loader = this.loadingCtrl.create({
      content: this.translateService.instant('text','loadingText'),
    });
    loader.present().then(() => {
    this.userService.getMyMessages().subscribe(jsonResponse=>{
      if(jsonResponse.success==true){
        this.messagesList = jsonResponse.rows;
      }else{
        this.alertService.showAlert(this.translateService.instant('error','title'),jsonResponse.msg);
      }
      loader.dismiss();
    },error => {
      this.alertService.showAlert(this.translateService.instant('error','title'),error);
      loader.dismiss();
    });
    });
  }

}

最后，提供者是:

import { Injectable } from '@angular/core';
import { HttpClient,HttpParams } from '@angular/common/http';
import { Globals} from '../app/globals';
import 'rxjs/add/operator/map';
import {Observable} from 'rxjs/Observable';
import {User} from '../app/models/user';
import {JsonResponse} from '../app/models/json-response';
@Injectable()
export class UserService {

  constructor(private httpClient : HttpClient, private globals: Globals){}

  public getMyMessages() : Observable<any>{
    return this.httpClient.get("myurl");
  }

}

推荐答案

因此，我终于找到了一个解决方案: 在您的.htaccess中设置像这样的Cache Control的标题

So, I finally found a solution : in your .htaccess set the header for Cache Control like this

Header set Cache-Control "private, s-maxage=0, max-age=0, max-age=0, must-revalidate"

这篇关于如何在ionic 3应用程序中禁用请求缓存或添加刷新?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！