fetch(url,

{

method: data?'POST':'GET', // *GET, POST, PUT, DELETE, etc.

mode: 'same-origin', // no-cors, cors, *same-origin

cache: 'default', // *default, no-cache, reload, force-cache, only-if-cached

credentials: 'same-origin', // include, *same-origin, omit

headers: {

// 'Content-Type': 'application/json',

'Content-Type': 'application/x-www-form-urlencoded',

// 'Content-Type': 'multipart/form-data', // 첨부파일 업로드인 경우

},

redirect: 'follow', // manual, *follow, error

referrer: 'client', // no-referrer, *client

referrerPolicy:'', // empty-string, "no-referrer", "no-referrer-when-downgrade", "same-origin", "origin", "strict-origin", "origin-when-cross-origin", "strict-origin-when-cross-origin", or "unsafe-url".

// integrity:'',

// keepalive:''

//(new AbortController()).signal, //signal //실험적 기능. 사용하지 말자.

// body: bodyData, // body data type must match "Content-Type" header //GET, HEAD 인 경우 body가 있으면 안된다.

body: data, //  Blob, BufferSource, FormData, URLSearchParams, USVString, or ReadableStream // body data type must match "Content-Type" header //GET, HEAD 인 경우 body가 있으면 안된다.

})

.then(function(response){

console.log("response",response)

console.log("headers")

for(const kv of response.headers.entries()){

console.log(kv);

}

if(!response.ok){

throw new Error(`HTTP error! status: ${response.status}`); // http 응답 오류부

}else{

// OK

}

return response.text();  // response.arrayBuffer() .blob() .formData() .json() .text()

})

.then(function(text){

console.log(text)

})

.catch(function(error){

console.error(error);

})