What is vue's request interception?

Preface

With the rapid development of front-end technology, front-end frameworks are becoming more and more diverse. As a popular front-end MVVM framework, Vue.js continues to attract new developers to join Vue. js camp. In Vue.js, we often use AJAX requests to obtain data from the server, but before sending the request, we need to ensure the legality and security of the request. This requires the use of Vue.js's request interception mechanism. This article will give you an in-depth introduction to the request interception mechanism of Vue.js.

What is request interception?

In Vue.js, we generally use axios as the library for AJAX requests. Axios provides a request interception mechanism that can intercept and modify requests before they are sent. The request interceptor allows us to do some processing before sending the request, such as adding a token to the request header, or doing some permission verification before the request.

Implementation of request interception

First, we need to introduce axios and Vue:

import axios from 'axios'
import Vue from 'vue'

Then, we can define an axios instance:

const Axios = axios.create({
  baseURL: 'http://localhost:3000',
  timeout: 5000
})

Next , we need to let Vue intercept all requests, so we need to set a global interceptor in the configuration file. Under the src folder, create a new folder called interceptors, and then create a new file called index.js under the interceptors folder:

import Axios from '@/utils/axios'

// 请求拦截器
Axios.interceptors.request.use(config => {
  // 在发送请求之前做些什么
  const token = localStorage.getItem('token')
  if (token) {
    config.headers.Authorization = token
  }
  return config
})

// 响应拦截器
Axios.interceptors.response.use(response => {
  // 对响应数据做点什么
  return response
}, error => {
  // 对响应错误做点什么
  return Promise.reject(error)
})

Vue.prototype.$http = Axios

export default Axios

In this code, we define a request interceptor and a Response interceptor. In the request interceptor, we get the locally stored token and add it to the request header.

For the response interceptor, if the request is successful, the response data will be returned directly. If the request fails, Promise.reject will be returned and an error message will be thrown.

Finally, we need to reference the interceptors/index.js file in the main.js file:

import Axios from '@/interceptors'

// 将 Axios 挂载到 Vue 实例上
Vue.prototype.$http = Axios

At this point, we have successfully completed the implementation of Vue.js request interception. It can be seen from the code that the request interception mechanism is of great help to Vue.js applications and can greatly improve our development efficiency.

Summary

This article introduces the request interception mechanism of Vue.js. Interceptors allow us to intercept and modify requests before they are sent. In this way, we can do some processing before sending the request, such as adding token to the request header, or doing some permission verification before the request, etc. In Vue.js applications, requests with interception are inevitable, so it is very important to master the method of request interception.

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