Response

Response()

Создаёт новый экземпляр объекта Response.

Response.headers Только для чтения

Объект Headers, который описывает заголовок ответа.

Response.ok Только для чтения

Булевское значение, которое указывает, выполнился ли запрос успешно или нет (то есть находится ли код ответа в диапазоне 200–299).

Response.redirected Только для чтения

Указывает, является ли результат запроса перенаправлением.

Response.status Только для чтения

Код ответа.

Response.statusText Только для чтения

Строка, соответствующая коду ответа (например, OK для кода 200).

Response.trailers

A Promise resolving to a Headers object, associated with the response with Response.headers for values of the HTTP Trailer header.

Response.type Только для чтения

The type of the response (e.g., basic, cors).

Response.url Только для чтения

The URL of the response.

Response.useFinalURL

A boolean indicating whether this is the final URL of the response.

Response implements Body, so it also has the following properties available to it:

Body.body Только для чтения

A simple getter exposing a ReadableStream of the body contents.

Body.bodyUsed Только для чтения

Stores a Boolean that declares whether the body has been used in a response yet.

Response.clone()

Creates a clone of a Response object.

Response.error()

Returns a new Response object associated with a network error.

Response.redirect()

Creates a new response with a different URL.

Response implements Body, so it also has the following methods available to it:

Body.arrayBuffer()

Takes a Response stream and reads it to completion. It returns a promise that resolves with an ArrayBuffer.

Body.blob()

Takes a Response stream and reads it to completion. It returns a promise that resolves with a Blob.

Body.formData()

Takes a Response stream and reads it to completion. It returns a promise that resolves with a FormData object.

Body.json()

Takes a Response stream and reads it to completion. It returns a promise that resolves with the result of parsing the body text as JSON, which is a JavaScript value of datatype object, string, etc.

Body.text()

Takes a Response stream and reads it to completion. It returns a promise that resolves with a USVString (text).

In our basic fetch example (run example live) we use a simple fetch() call to grab an image and display it in an <img> element. The fetch() call returns a promise, which resolves to the Response object associated with the resource fetch operation.

You'll notice that since we are requesting an image, we need to run Body.blob (Response implements Body) to give the response its correct MIME type.

const image = document.querySelector(".my-image");
fetch("flowers.jpg")
  .then(function (response) {
    return response.blob();
  })
  .then(function (blob) {
    const objectURL = URL.createObjectURL(blob);
    image.src = objectURL;
  });

You can also use the Response.Response() constructor to create your own custom Response object:

const response = new Response();

Здесь мы с помощью функции doAjax вызываем PHP скрипт, который генерирует JSON строку, и возвращает распарсенный JSON в виде JavaScript объекта. Также реализована простая обработка ошибок.

// Функция, которая делает Ajax запрос
const doAjax = async () => {
    const response = await fetch('Ajax.php'); // Генерируем объект Response
    if (response.ok) {
        const jVal = await response.json(); // Парсим тело ответа
        return Promise.resolve(jVal);
        }
    else
        return Promise.reject('*** PHP file not found');
    }
}

// Вызываем doAjax и выводим результат в консоль
doAjax().then(console.log).catch(console.log);

• ServiceWorker API
• HTTP access control (CORS)
• HTTP