1、Query String Parameters

The parameters of the initiating get request are displayed on the url, and the parameters follow? Separate different parameters with &

Example (backendspringboot restfulstyle)
Front end:http://xxx/getTest?name=Test&password=Test 2
Backend: (Parameters can be received by class)

    @GetMapping("/getTest")
	public String test(String name,String password) {
		
		return "success";
	}

2、Form Data

If content-type is not set, the default is application/x-www-form-urlencoded for the Post body
Connect the parameters of the key-value pair with &, if there is a space, convert the space to + plus sign; if there is a special symbol, convert the special symbol to ASCII
HEX value is actually passed to the backend in the form of key value, so the backend should not use @RequestBody to receive it, that is, don’t use one class to receive it. Multiple parameters can be used because it is a key. Value pair, so you have to receive it by key value, and if there is a file or the like, it is multipart/form-data
For Get, because the browser is the default application/x-www-form-urlencoded, the first type of Query String
Parameters are actually the result of not setting the content-type. What are the parameters? Separate different parameters with &

Example (backendspringboot restfulstyle)
Front end:http://xxx/getTest?name=Test&password=Test 2(Not displayed on the browser). Parameters withForm DataPass in the form of key-value pairs
Backend: (Parameters can be received by class)

    @PostMapping("/getTest")
	public String test(String name,String password) {
		
		return "success";
	}

3、Request Payload

The content-type is application/json, the post request parameter is located in the body, and a json serialized json string is passed to the backend. The backend should be accepted as a class or vo and annotated with RequstBody

front end:http://xxx/getTest
Backend: (Parameters can be received by class)

 @PostMapping("/getTest")
	public String test(@RequestBody request vo) {
		
		return "success";
	}

A journey of a thousand miles
starts with one step