Interface (Summary)

1. Create interface steps (summarize previous lessons)

   1. Create the basic server: app.js

      const express = require('express')
      const app = express()
      //main code
      app.listen(80, function(){
          console.log('Express server running at http://127.0.0.1')
      })

      
      

   2. Create an API routing module

      apiRouter.js routing module

      const express = require('express')
      const apiRouter = express.Router()
      //main code
      module.exports = apiRouter

      app.js import and register routing module

      const apiRouter = require('./apiRouter.js')
      app.use('/api', apiRouter)

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2. Write a GET interface

   apiRouter.get('/get', (req, res) => {
        const query = req.query //req.query can access the parameters sent to the server in the form of query strings, see 4.1.8 for details.
        res.send({
            status: 0, //0 succeeds, 1 fails
            msg:'GET request succeed',
            data:query
        })
   })

​

3. Write POST interface

   apiRouter.post('/post', (req, res) => { //Get the URL-encoded data sent by the client to the server through the request body
        const body = req.body //req.body object, which can access the request body data, see 4.5.5 for details.
        res.send({
            status: 0, //0 succeeds, 1 fails
            msg:'POST request succeed',
            data:body
        })
   })

   Note: If you want to get the request body data in URL-encoded format, you must configure the middleware:

   app.use(express.urlencoded({extended:false}))

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4. Interface cross domain problem

   The above GET/POST interface does not support cross-domain requests. (It appears that postman can request success, but the request in the html page cannot be successful.)

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