How does vue request multiple server addresses?

Preface

In front-end development, our use of the Vue framework often involves Ajax requests. Usually, the interfaces we need to request are provided by the same server. But in some scenarios, we need to request multiple different server addresses. For example, when developing a hybrid application, we need to request multiple different servers to obtain data. This article will introduce how to request multiple server addresses in Vue.

Option 1: Use axios

axios is a Promise-based HTTP request library that can be used in browsers and node.js. The officially recommended ajax library for Vue.js is axios.

We can install axios through npm in the Vue project:

npm install axios --save

In specific use, we can change the default request configuration by modifying the defaults attribute of axios. Here, we can change the default address of the request by modifying the baseURL of the defaults attribute. As shown in the following code:

//创建axios实例
let instance = axios.create({
  baseURL: 'http://localhost:8080'
})

//第一个接口请求
instance.get('/api/employee')
  .then(function(response) {
    console.log(response.data)
  })
  .catch(function(error) {
    console.log(error)
  })

//第二个接口请求
instance.get('/api/company')
  .then(function(response) {
    console.log(response.data)
  })
  .catch(function(error) {
    console.log(error)
  })

In the above code, we created an axios instance and set the base address to http://localhost:8080 through the defaults attribute, and then requested /api/employee and /api/company two interfaces.

However, there are some problems with this method. If we request more server addresses, it may cause code redundancy. In addition, this method cannot be used if the address we need to request is determined at runtime.

Option 2: Use async/await

By using async/await, we can request multiple different server addresses more concisely. The following is a code example using async/await:

async function loadData() {
  try {
    let employee = await axios.get('http://localhost:8080/api/employee')
    console.log(employee.data)

    let company = await axios.get('http://localhost:8081/api/company')
    console.log(company.data)
  } catch (error) {
    console.log(error)
  }
}

loadData()

Through async/await, we can request multiple server addresses very concisely in the code. However, there are also some problems with this approach. For example, if a large number of requested addresses are used, using async/await may cause the request process to become very slow.

Option 3: Use Promise.all

We can also use JavaScript’s native Promise.all method to request multiple server addresses. Promise.all accepts an array of Promise objects as parameters, and then waits for all Promise objects to be resolved before returning them uniformly.

Promise.all([
  axios.get('http://localhost:8080/api/employee'), 
  axios.get('http://localhost:8081/api/company')
])
.then(function(result) {
  console.log(result[0].data)
  console.log(result[1].data)
})
.catch(function(error) {
  console.log(error)
});

The above code will request the two addresses 'http://localhost:8080/api/employee' and 'http://localhost:8081/api/company' at the same time, and in both requests Output their results upon successful return.

Summary

The above are three ways to request multiple server addresses in Vue. Each method has its advantages and disadvantages, and we can choose the method that suits us best according to the specific situation. In development, we need to use technology flexibly according to actual needs to provide users with excellent products and services.

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