如何在 ionic 3 应用程序中禁用请求缓存或添加刷新？

Question

我的 ionic 应用程序有问题：在 ionViewWillEnter() 上，我使用 GET 请求请求服务器以获取数据。如果我第一次打开该页面，则会发送请求。如果是第二次打开，应用程序读取缓存并且不发送请求。这个问题只存在于设备上。任何的想法？谢谢

编辑：我正在使用这个版本： @ionic/app-scripts : 3.2.0
科尔多瓦平台：ios 4.5.5
离子框架：ionic-angular 3.9.2

所有请求都进入拦截器：

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);
   }
};

我在我的服务器上启用了所有 CORS。

在我的控制器中，我这样做：

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，提供商是：

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");
  }

}

Answer 1

所以，我终于找到了解决办法：在你的 .htaccess 中为缓存控制设置 header 像这样

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

如何在 ionic 3 应用程序中禁用请求缓存或添加刷新？

How to disable request caching or add refresh in ionic 3 app?

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