How does XMLHttpRequest pass data?

Question

AJAX

I accidentally forgot to change the request type from 'GET' to 'POST', but the data was successfully sent to the server!

var xhr = new XMLHttpRequest();
xhr.open("GET", url);
xhr.setRequestHeader('Content-type', 'application/json');
xhr.send('{"name":"' + name + '","age":"' + age + '"}');

In this regard, two questions:
1) It turns out that it does not matter what to specify - "GET" or "POST" - what is important is just passed to .send() ?
2) If you don't use JSON.stringify() then how should you prepare the json data before sending it?

Answer 1

There is a difference between a get and a post.
The fact that you got the correct answer is a backend error on the one hand and luck on the other, because you transferred little data. Try getom "send" a hundred megs

Answer 2

1. Has. Both in terms of the volume of the transmitted request, and in any REST.
2. Can be manually{"a":"b"}