Why use Vue's reverse proxy?

In vue, because the reverse proxy can hide the real server and bypass the cross-domain problem caused by directly requesting the real URL, it is necessary to use a reverse proxy to avoid cross-domain problems; reverse proxy It is often used in scenarios where front-end and back-end are developed separately. The front-end needs to connect to the back-end interface and send requests from the same source to the reverse proxy server.

The operating environment of this article: Windows 10 system, Vue version 2.9.6, DELL G3 computer.

Why use vue’s reverse proxy

Reverse proxy usage scenario

In the scenario of separate development of front-end and back-end, there is a server in the front-end (provided Static page), the backend has a server (providing an interface)

At this time, the frontend needs to connect to the backend interface, and cross-domain problems will occur

In the release environment, if there is a cross-domain Problem, use nginx

If the front-end and back-end codes are on the same server, there is no cross-domain problem

Cross-domain solution

jsonp (front-end solution Solution)

CORS (back-end solution): cross origin resource sharing

Reverse proxy (front-end solution)

What is a reverse proxy

Reverse proxy hides the real server, so that the browser is still from the same origin

Reverse proxy principle

By forging requests to make http The request is from the same source, and then the request from the same source is sent to the reverse proxy server, and the reverse proxy server requests the real URL, thus bypassing the cross-domain problems caused by directly requesting the real URL

Configuration of reverse proxy

Reverse proxy of vue-cli3

Create a new vue.config.js file in the project root directory

Configuration Code:

module.exports = {undefined
  lintOnSave:false,
  devServer:{undefined
    proxy: { 
      '/api': { 
             target: 'http://localhost:80',
             changeOrigin: true, 
             pathRewrite: {undefined
                '^/api': ""   
              }，
        '/apidouban': {undefined
             target: 'http://localhost:3001',
             changeOrigin: true, 
             pathRewrite: {undefined
                '^/apidouban': ""
              }
          }
      }
   }
}

Reverse proxy execution process:

Convert /api in axios access address to target /api:

(eg: http:localhost:9000/api /goods is converted to http://localhost:80/api/goods)

Create a virtual server

Remove /api:

(eg: http://localhost: 80/goods)

[Related recommendations: "vue.js tutorial"]

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