How to carry cookies with every request in UniApp

UniApp is a cross-platform development framework that supports writing once and running on multiple terminals. With the development of the mobile Internet, more and more front-end engineers choose to use UniApp to develop applications. However, in actual development, UniApp does not carry cookies by default when requesting data, which brings some trouble to users. So, how to carry cookies with every request in UniApp?

First of all, we need to understand what a cookie is. It is a small text file saved on the client, which contains some information about the user. For example, when we log in to a website, the server will set a cookie to save on the client. When we visit the website again in the future, it will bring this cookie to achieve the effect of remembering the login status.

The method of carrying Cookie in every request in UniApp is as follows:

1. Add the header attribute in the uni.request() method. The header attribute can set the request header. Set cookies. For example:

   uni.request({
     url: '',
     method: '',
     header: {
       Cookie: '' // 在这里设置Cookie
     },
     success(res) {}
   })

   In the above code, we added Cookie to the header attribute. The value of this Cookie can be obtained by parsing the Cookie set by the browser.

2. Add a global interceptor in main.js, intercept the request and add Cookie to the request header. For example:

   uni.addInterceptor('request', {
     success: function(request) {
       let cookies = uni.getStorageSync('cookies') // 获取保存在本地的cookies
       if (cookies) {
         request.header.Cookie = cookies // 将每次的请求头中加入Cookies
       }
     }
   })

   In the above code, we use the addInterceptor() method provided by UniApp to add a request interceptor and set a cookie in the interceptor. Each time a request is made, the interceptor will prioritize the request and add the locally saved Cookie to the request header, thereby achieving the effect of carrying Cookie in every request.

No matter which method is used, as long as we can add Cookie in the request header, we can achieve the effect of carrying Cookie in every request. During development, we can choose which method to use based on actual needs.

In short, carrying cookies with every request in UniApp is a very practical function. It can help us implement some functions that require login status and improve user experience. I hope this article can help everyone, and I hope everyone can be more comfortable in development!

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