XHR객체의 readyState, status 상태값
September 12, 2018 - [XMLHttpRequest, status, readyState]
서버로 요청을 수행할 때 XHR객체의 readyState, status 상태값의 변화는 다음과 같다
See the Pen xhr-state by Song, MinGu (@min9nim) on CodePen.
readyState 값을 통해 요청의 진행 단계를 확인할 수 있다
| Value | State | Description |
|---|---|---|
| 0 | UNSENT | Client has been created. open() not called yet. |
| 1 | OPENED | open() has been called. |
| 2 | HEADERS_RECEIVED | send() has been called, and headers and status are available. |
| 3 | LOADING | Downloading; responseText holds partial data. |
| 4 | DONE | The operation is complete. |
Ref.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/readyState