跨域请求被阻止:相同来源策略不允许读取缺少远程...... CORS标头"Access-Control-Allow-Origin" [英] Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote ...............CORS header ‘Access-Control-Allow-Origin’ missing
问题描述
我在 http://localhost:3000/edata
[{"_id":"598705ac8f79380367e0a7f2","name":"prasad","age":"28","gender":"male","phone":8790440944},{"_id":"598733508f79380367e0a7f8","name":"ravi","age":"27","gender":"male","phone":"9912881777"}
我希望在运行客户端应用程序时获取此数据,即 http://localhost:4200
i want this data to be get when i run my client application i.e http://localhost:4200
app.module.ts
app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import {HttpModule} from "@angular/http";
import { AppComponent } from './app.component';
import {TasksComponent} from "../tasks/tasks.component";
import {TaskServices} from "./services/task.services";
@NgModule({
declarations: [AppComponent, TasksComponent],
imports: [BrowserModule,HttpModule],
providers: [TaskServices],
bootstrap: [AppComponent,TasksComponent]
})
export class AppModule { }
tasks.component.ts
tasks.component.ts
import {Component, enableProdMode} from '@angular/core';
import {TaskServices} from "../app/services/task.services";
enableProdMode();
@Component({
selector: 'tasks',
templateUrl: './tasks.component.html',
styleUrls: ['./tasks.component.css']
})
export class TasksComponent {
constructor(private taskServices:TaskServices){
this.taskServices.getTasks()
.subscribe(tasks =>{
console.log(tasks);
});
}
title = 'app';
}
task.services.ts
task.services.ts
import {Injectable} from '@angular/core';
import {Http, Headers} from "@angular/http";
import 'rxjs/add/operator/map';
@Injectable()
export class TaskServices{
constructor(private http:Http){
console.log('Task service initialized....');
}
getTasks(){
return this.http.get('http://localhost:3000/edata')
.map(res => res.json());
}
当我运行应用程序时,在控制台中我收到错误跨域请求被阻止的消息:同源策略"不允许读取
when i run application ,in the console i am getting the error Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:3000/edata. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
如何解决该错误以及如何从其他主机获取数据...请帮助我.
how to Fix the error.and how to get data from the other host...plz help me.
推荐答案
如果使用 Node-server ,请将其添加到server.js
If using Node-server add this in your server.js
app.use(function (req, res, next) {
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE');
res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
res.setHeader('Access-Control-Allow-Credentials', true);
next();
});
并在您的http方法中添加听到者
and Add Hearders in your http method
return this.http.get(
'http://localhost:3000/edata',{
headers: {'Content-Type', undefined} /** Use Content-type as your requirement undifined OR application/json**/
}).map(res => res.json())
这篇关于跨域请求被阻止:相同来源策略不允许读取缺少远程...... CORS标头"Access-Control-Allow-Origin"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!